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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Streamlit Reference</title>
<link href="https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap" rel="stylesheet" />
<style>
:root {
--bg: #0b0f1a;
--surface: #111827;
--surface2: #1a2236;
--border: #1f2d45;
--accent: #00d4ff;
--accent2: #ff6b6b;
--accent3: #a78bfa;
--accent4: #34d399;
--accent5: #fbbf24;
--text: #e2e8f0;
--muted: #64748b;
--code-bg: #0d1117;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
background: var(--bg);
color: var(--text);
font-family: 'DM Sans', sans-serif;
font-size: 14px;
line-height: 1.6;
}
/* ── HEADER ── */
header {
position: sticky;
top: 0;
z-index: 100;
background: rgba(11,15,26,.92);
backdrop-filter: blur(12px);
border-bottom: 1px solid var(--border);
padding: 12px 24px;
display: flex;
align-items: center;
gap: 24px;
}
.logo {
font-family: 'Syne', sans-serif;
font-weight: 800;
font-size: 20px;
letter-spacing: -.5px;
color: var(--accent);
white-space: nowrap;
}
.logo span { color: var(--accent2); }
#search {
flex: 1;
max-width: 480px;
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 8px;
padding: 7px 14px 7px 36px;
color: var(--text);
font-size: 13px;
font-family: 'DM Sans', sans-serif;
outline: none;
transition: border-color .2s;
background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M11.742 10.344a6.5 6.5 0 1 0-1.397 1.398h-.001c.03.04.062.078.098.115l3.85 3.85a1 1 0 0 0 1.415-1.414l-3.85-3.85a1.007 1.007 0 0 0-.115-.099zm-5.242 1.656a5.5 5.5 0 1 1 0-11 5.5 5.5 0 0 1 0 11z'/%3E%3C/svg%3E");
background-repeat: no-repeat;
background-position: 12px center;
}
#search:focus { border-color: var(--accent); }
#search::placeholder { color: var(--muted); }
/* ── LAYOUT ── */
.shell {
display: flex;
min-height: calc(100vh - 53px);
}
/* ── SIDEBAR ── */
nav {
width: 230px;
flex-shrink: 0;
border-right: 1px solid var(--border);
padding: 20px 0;
position: sticky;
top: 53px;
height: calc(100vh - 53px);
overflow-y: auto;
}
nav::-webkit-scrollbar { width: 4px; }
nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.nav-section { margin-bottom: 4px; }
.nav-label {
font-family: 'Syne', sans-serif;
font-size: 10px;
font-weight: 700;
letter-spacing: 1.5px;
text-transform: uppercase;
color: var(--muted);
padding: 10px 20px 4px;
}
.nav-link {
display: flex;
align-items: center;
gap: 8px;
padding: 6px 20px;
color: var(--muted);
text-decoration: none;
font-size: 13px;
border-left: 2px solid transparent;
transition: all .15s;
cursor: pointer;
}
.nav-link:hover, .nav-link.active {
color: var(--text);
border-left-color: var(--accent);
background: rgba(0,212,255,.05);
}
.nav-dot {
width: 6px; height: 6px;
border-radius: 50%;
flex-shrink: 0;
}
/* ── MAIN ── */
main {
flex: 1;
padding: 32px 40px;
max-width: 1100px;
}
/* ── CATEGORY SECTION ── */
.cat-section {
margin-bottom: 56px;
scroll-margin-top: 72px;
}
.cat-header {
display: flex;
align-items: center;
gap: 12px;
margin-bottom: 20px;
padding-bottom: 12px;
border-bottom: 1px solid var(--border);
}
.cat-icon {
width: 34px; height: 34px;
border-radius: 8px;
display: flex; align-items: center; justify-content: center;
font-size: 16px;
flex-shrink: 0;
}
.cat-title {
font-family: 'Syne', sans-serif;
font-weight: 700;
font-size: 20px;
letter-spacing: -.3px;
}
.cat-count {
margin-left: auto;
font-family: 'JetBrains Mono', monospace;
font-size: 11px;
color: var(--muted);
background: var(--surface2);
padding: 2px 8px;
border-radius: 12px;
border: 1px solid var(--border);
}
/* ── FUNCTION GRID ── */
.fn-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
gap: 10px;
}
/* ── FUNCTION CARD ── */
.fn-card {
background: var(--surface);
border: 1px solid var(--border);
border-radius: 10px;
padding: 14px 16px;
transition: border-color .2s, transform .2s;
cursor: default;
}
.fn-card:hover {
border-color: var(--accent);
transform: translateY(-1px);
}
.fn-card.hidden { display: none; }
.fn-top {
display: flex;
align-items: flex-start;
gap: 8px;
margin-bottom: 6px;
}
.fn-name {
font-family: 'JetBrains Mono', monospace;
font-size: 13px;
font-weight: 600;
color: var(--accent);
flex: 1;
word-break: break-all;
}
.fn-badge {
font-size: 9px;
font-family: 'Syne', sans-serif;
font-weight: 700;
letter-spacing: .8px;
text-transform: uppercase;
padding: 2px 6px;
border-radius: 4px;
white-space: nowrap;
flex-shrink: 0;
}
.badge-widget { background: rgba(0,212,255,.12); color: var(--accent); border: 1px solid rgba(0,212,255,.25); }
.badge-display { background: rgba(52,211,153,.12); color: var(--accent4); border: 1px solid rgba(52,211,153,.25); }
.badge-layout { background: rgba(167,139,250,.12); color: var(--accent3); border: 1px solid rgba(167,139,250,.25); }
.badge-media { background: rgba(251,191,36,.12); color: var(--accent5); border: 1px solid rgba(251,191,36,.25); }
.badge-state { background: rgba(255,107,107,.12); color: var(--accent2); border: 1px solid rgba(255,107,107,.25); }
.badge-flow { background: rgba(100,116,139,.12); color: #94a3b8; border: 1px solid rgba(100,116,139,.25); }
.badge-class { background: rgba(251,191,36,.15); color: var(--accent5); border: 1px solid rgba(251,191,36,.3); }
.fn-sig {
font-family: 'JetBrains Mono', monospace;
font-size: 11px;
color: var(--muted);
margin-bottom: 6px;
word-break: break-all;
}
.fn-desc {
font-size: 12.5px;
color: #94a3b8;
line-height: 1.5;
}
.fn-desc strong { color: var(--text); font-weight: 500; }
/* ── RETURNS PILL ── */
.fn-returns {
margin-top: 8px;
font-family: 'JetBrains Mono', monospace;
font-size: 10px;
color: var(--muted);
}
.fn-returns span {
color: var(--accent4);
}
/* ── SUBCATEGORY LABEL ── */
.subcat {
grid-column: 1 / -1;
font-family: 'Syne', sans-serif;
font-size: 11px;
font-weight: 700;
letter-spacing: 1.2px;
text-transform: uppercase;
color: var(--muted);
margin-top: 8px;
margin-bottom: 2px;
padding-left: 2px;
}
/* ── NOTE BOX ── */
.note {
background: rgba(0,212,255,.06);
border: 1px solid rgba(0,212,255,.2);
border-radius: 8px;
padding: 10px 14px;
font-size: 12.5px;
color: #94a3b8;
margin-bottom: 16px;
}
.note strong { color: var(--accent); }
/* ── EMPTY STATE ── */
#no-results {
display: none;
text-align: center;
padding: 60px 20px;
color: var(--muted);
}
#no-results .nr-icon { font-size: 40px; margin-bottom: 12px; }
#no-results p { font-size: 14px; }
/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
</style>
</head>
<body>
<!-- HEADER -->
<header>
<div class="logo">st<span>.</span>ref</div>
<input type="text" id="search" placeholder="Search functions, e.g. button, sidebar, cache…" />
</header>
<div class="shell">
<!-- SIDEBAR NAV -->
<nav id="sidebar">
<div class="nav-section">
<div class="nav-label">Categories</div>
<a class="nav-link active" onclick="scrollTo('text')">
<span class="nav-dot" style="background:#34d399"></span>Text & Display
</a>
<a class="nav-link" onclick="scrollTo('data')">
<span class="nav-dot" style="background:#00d4ff"></span>Data & Tables
</a>
<a class="nav-link" onclick="scrollTo('chart')">
<span class="nav-dot" style="background:#a78bfa"></span>Charts & Media
</a>
<a class="nav-link" onclick="scrollTo('input')">
<span class="nav-dot" style="background:#fbbf24"></span>Input Widgets
</a>
<a class="nav-link" onclick="scrollTo('layout')">
<span class="nav-dot" style="background:#f472b6"></span>Layout & Containers
</a>
<a class="nav-link" onclick="scrollTo('state')">
<span class="nav-dot" style="background:#ff6b6b"></span>State Management
</a>
<a class="nav-link" onclick="scrollTo('flow')">
<span class="nav-dot" style="background:#94a3b8"></span>Control Flow
</a>
<a class="nav-link" onclick="scrollTo('perf')">
<span class="nav-dot" style="background:#fb923c"></span>Performance
</a>
<a class="nav-link" onclick="scrollTo('conn')">
<span class="nav-dot" style="background:#38bdf8"></span>Connections & DB
</a>
<a class="nav-link" onclick="scrollTo('config')">
<span class="nav-dot" style="background:#c084fc"></span>Config & Utilities
</a>
<a class="nav-link" onclick="scrollTo('classes')">
<span class="nav-dot" style="background:#fbbf24"></span>Classes & Objects
</a>
</div>
</nav>
<!-- MAIN CONTENT -->
<main id="main">
<div id="no-results">
<div class="nr-icon">🔍</div>
<p>No functions matched your search.</p>
</div>
<!-- ── TEXT & DISPLAY ── -->
<section class="cat-section" id="text">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(52,211,153,.12)">📝</div>
<div class="cat-title" style="color:#34d399">Text & Display</div>
<div class="cat-count">12 functions</div>
</div>
<div class="note"><strong>Tip:</strong> All write functions accept Markdown. Use <code>unsafe_allow_html=True</code> on <code>st.markdown</code> for raw HTML.</div>
<div class="fn-grid">
<div class="fn-card" data-tags="write title text markdown header">
<div class="fn-top"><span class="fn-name">st.write()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">*args, unsafe_allow_html=False</div>
<div class="fn-desc">Swiss-army knife output. Accepts <strong>strings, DataFrames, dicts, Plotly figs, Altair, Matplotlib, errors</strong> — renders each intelligently.</div>
</div>
<div class="fn-card" data-tags="title heading h1">
<div class="fn-top"><span class="fn-name">st.title()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, anchor=None, help=None</div>
<div class="fn-desc">Large <strong>H1-level</strong> page title. Shows an anchor link on hover.</div>
</div>
<div class="fn-card" data-tags="header heading h2 h3">
<div class="fn-top"><span class="fn-name">st.header()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, anchor=None, divider=False</div>
<div class="fn-desc"><strong>H2-level</strong> section heading. Optional horizontal divider below.</div>
</div>
<div class="fn-card" data-tags="subheader heading h3">
<div class="fn-top"><span class="fn-name">st.subheader()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, anchor=None, divider=False</div>
<div class="fn-desc"><strong>H3-level</strong> sub-section heading.</div>
</div>
<div class="fn-card" data-tags="markdown text html bold italic">
<div class="fn-top"><span class="fn-name">st.markdown()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, unsafe_allow_html=False, help=None</div>
<div class="fn-desc">Render <strong>Markdown or HTML</strong>. Set <code>unsafe_allow_html=True</code> for raw HTML injection.</div>
</div>
<div class="fn-card" data-tags="caption small text muted">
<div class="fn-top"><span class="fn-name">st.caption()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, unsafe_allow_html=False, help=None</div>
<div class="fn-desc">Small <strong>muted caption text</strong>. Ideal for footnotes and labels.</div>
</div>
<div class="fn-card" data-tags="code snippet monospace highlight syntax">
<div class="fn-top"><span class="fn-name">st.code()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, language='python', line_numbers=False</div>
<div class="fn-desc">Syntax-highlighted <strong>code block</strong>. Supports 30+ languages.</div>
</div>
<div class="fn-top" style="display:none"></div>
<div class="fn-card" data-tags="text plain monospace">
<div class="fn-top"><span class="fn-name">st.text()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, help=None</div>
<div class="fn-desc">Fixed-width <strong>plain text</strong>. No Markdown rendering.</div>
</div>
<div class="fn-card" data-tags="latex math equation formula">
<div class="fn-top"><span class="fn-name">st.latex()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, help=None</div>
<div class="fn-desc">Render <strong>LaTeX equations</strong> using KaTeX. Pass a raw LaTeX string.</div>
</div>
<div class="fn-card" data-tags="divider horizontal rule separator line">
<div class="fn-top"><span class="fn-name">st.divider()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">(no args)</div>
<div class="fn-desc">A simple <strong>horizontal rule</strong> for visual separation.</div>
</div>
<div class="fn-card" data-tags="echo code show source">
<div class="fn-top"><span class="fn-name">st.echo()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">code_location='above'</div>
<div class="fn-desc"><strong>Context manager</strong> — displays the code inside the block, then runs it. Great for tutorials.</div>
</div>
<div class="fn-card" data-tags="help docstring tooltip documentation">
<div class="fn-top"><span class="fn-name">st.help()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">obj</div>
<div class="fn-desc">Displays an object's <strong>docstring</strong> — like <code>help()</code> but rendered beautifully.</div>
</div>
</div>
</section>
<!-- ── DATA & TABLES ── -->
<section class="cat-section" id="data">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(0,212,255,.12)">📊</div>
<div class="cat-title" style="color:#00d4ff">Data & Tables</div>
<div class="cat-count">5 functions</div>
</div>
<div class="fn-grid">
<div class="fn-card" data-tags="dataframe table pandas interactive sort filter">
<div class="fn-top"><span class="fn-name">st.dataframe()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">data, width, height, use_container_width, hide_index, column_order, column_config, on_select, selection_mode</div>
<div class="fn-desc"><strong>Interactive table</strong> with sorting, resizing, search. Accepts pandas, NumPy, Snowpark, and more. Use <code>column_config</code> for custom cell renderers.</div>
<div class="fn-returns">returns → <span>None or SelectionState</span></div>
</div>
<div class="fn-card" data-tags="table static pandas dataframe simple">
<div class="fn-top"><span class="fn-name">st.table()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">data</div>
<div class="fn-desc"><strong>Static HTML table</strong> — no scrolling or sorting. Best for small, stable datasets.</div>
</div>
<div class="fn-card" data-tags="metric kpi number delta value">
<div class="fn-top"><span class="fn-name">st.metric()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">label, value, delta=None, delta_color='normal', help, label_visibility</div>
<div class="fn-desc">KPI card showing a <strong>big number</strong> with a colored delta arrow. Great with <code>st.columns()</code>.</div>
</div>
<div class="fn-card" data-tags="json tree dict display nested">
<div class="fn-top"><span class="fn-name">st.json()</span><span class="fn-badge badge-display">display</span></div>
<div class="fn-sig">body, expanded=True</div>
<div class="fn-desc">Renders a <strong>collapsible JSON tree</strong>. Accepts dicts, lists, or JSON strings.</div>
</div>
<div class="fn-card" data-tags="data editor editable table cell input">
<div class="fn-top"><span class="fn-name">st.data_editor()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">data, *, num_rows='fixed', disabled=False, key, on_change, column_config, hide_index</div>
<div class="fn-desc"><strong>Editable table</strong> — users can type into cells. Returns the modified DataFrame.</div>
<div class="fn-returns">returns → <span>DataFrame / dict / list</span></div>
</div>
</div>
</section>
<!-- ── CHARTS & MEDIA ── -->
<section class="cat-section" id="chart">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(167,139,250,.12)">📈</div>
<div class="cat-title" style="color:#a78bfa">Charts & Media</div>
<div class="cat-count">15 functions</div>
</div>
<div class="fn-grid">
<div class="subcat">Native Charts</div>
<div class="fn-card" data-tags="line chart graph plot time series">
<div class="fn-top"><span class="fn-name">st.line_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">data, x, y, color, width, height, use_container_width</div>
<div class="fn-desc"><strong>Line chart</strong> built on Vega-Lite. Ideal for time series.</div>
</div>
<div class="fn-card" data-tags="bar chart graph plot column">
<div class="fn-top"><span class="fn-name">st.bar_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">data, x, y, color, horizontal=False, stack=True</div>
<div class="fn-desc"><strong>Bar chart</strong>. Use <code>horizontal=True</code> for horizontal bars.</div>
</div>
<div class="fn-card" data-tags="area chart fill graph">
<div class="fn-top"><span class="fn-name">st.area_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">data, x, y, color, stack</div>
<div class="fn-desc"><strong>Area chart</strong> — line with filled area. Supports stacking.</div>
</div>
<div class="fn-card" data-tags="scatter plot points dot chart">
<div class="fn-top"><span class="fn-name">st.scatter_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">data, x, y, color, size</div>
<div class="fn-desc"><strong>Scatter plot</strong>. Map color and size to columns for bubble charts.</div>
</div>
<div class="fn-card" data-tags="map geo location points coordinates">
<div class="fn-top"><span class="fn-name">st.map()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">data, latitude, longitude, color, size, zoom, use_container_width</div>
<div class="fn-desc">Renders a <strong>Mapbox map</strong> from lat/lon data. Zero config needed.</div>
</div>
<div class="subcat">Third-party Chart Libraries</div>
<div class="fn-card" data-tags="plotly chart interactive 3d">
<div class="fn-top"><span class="fn-name">st.plotly_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">figure_or_data, use_container_width, theme, on_select, selection_mode, key</div>
<div class="fn-desc">Render a <strong>Plotly figure</strong>. Supports 3D, animations, and click events.</div>
</div>
<div class="fn-card" data-tags="altair vega chart declarative">
<div class="fn-top"><span class="fn-name">st.altair_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">altair_chart, use_container_width, theme, on_select, key</div>
<div class="fn-desc">Render an <strong>Altair/Vega-Lite</strong> chart object.</div>
</div>
<div class="fn-card" data-tags="matplotlib pyplot figure plot">
<div class="fn-top"><span class="fn-name">st.pyplot()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">fig=None, clear_figure=None, use_container_width=True</div>
<div class="fn-desc">Render a <strong>Matplotlib figure</strong>. Pass a <code>fig</code> object or use the global pyplot state.</div>
</div>
<div class="fn-card" data-tags="bokeh chart interactive plot">
<div class="fn-top"><span class="fn-name">st.bokeh_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">figure, use_container_width=False</div>
<div class="fn-desc">Render a <strong>Bokeh</strong> figure.</div>
</div>
<div class="fn-card" data-tags="pydeck deck gl map 3d geospatial">
<div class="fn-top"><span class="fn-name">st.pydeck_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">pydeck_obj, use_container_width, height, on_select, selection_mode, key</div>
<div class="fn-desc">Render a <strong>PyDeck/deck.gl</strong> map — supports 3D layers, H3, arc layers.</div>
</div>
<div class="fn-card" data-tags="graphviz dot graph network tree">
<div class="fn-top"><span class="fn-name">st.graphviz_chart()</span><span class="fn-badge badge-media">chart</span></div>
<div class="fn-sig">figure_or_dot, use_container_width=False</div>
<div class="fn-desc">Render a <strong>Graphviz</strong> network/tree diagram from a DOT string or graphviz object.</div>
</div>
<div class="subcat">Media</div>
<div class="fn-card" data-tags="image photo picture display show">
<div class="fn-top"><span class="fn-name">st.image()</span><span class="fn-badge badge-media">media</span></div>
<div class="fn-sig">image, caption, width, use_container_width, clamp, channels, output_format</div>
<div class="fn-desc">Display <strong>images</strong>: file paths, URLs, PIL objects, NumPy arrays, or lists thereof.</div>
</div>
<div class="fn-card" data-tags="audio sound mp3 wav play">
<div class="fn-top"><span class="fn-name">st.audio()</span><span class="fn-badge badge-media">media</span></div>
<div class="fn-sig">data, format='audio/wav', start_time=0, sample_rate, end_time, loop, autoplay</div>
<div class="fn-desc">HTML5 <strong>audio player</strong>. Accepts file path, URL, bytes, or NumPy array.</div>
</div>
<div class="fn-card" data-tags="video mp4 play stream">
<div class="fn-top"><span class="fn-name">st.video()</span><span class="fn-badge badge-media">media</span></div>
<div class="fn-sig">data, format, start_time, subtitles, end_time, loop, autoplay, muted</div>
<div class="fn-desc">HTML5 <strong>video player</strong>. Supports YouTube URLs and local files. SRT subtitle support.</div>
</div>
<div class="fn-card" data-tags="logo icon brand sidebar header image">
<div class="fn-top"><span class="fn-name">st.logo()</span><span class="fn-badge badge-media">media</span></div>
<div class="fn-sig">image, *, link=None, icon_image=None</div>
<div class="fn-desc">Renders your <strong>app logo</strong> in the sidebar top-left. Optionally clickable.</div>
</div>
</div>
</section>
<!-- ── INPUT WIDGETS ── -->
<section class="cat-section" id="input">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(251,191,36,.12)">🎛️</div>
<div class="cat-title" style="color:#fbbf24">Input Widgets</div>
<div class="cat-count">20 functions</div>
</div>
<div class="note"><strong>All widgets share:</strong> <code>key</code> (session state key), <code>help</code> (tooltip), <code>on_change</code> (callback), <code>args/kwargs</code> (callback args), <code>disabled</code>, <code>label_visibility</code>.</div>
<div class="fn-grid">
<div class="subcat">Buttons & Actions</div>
<div class="fn-card" data-tags="button click action submit press">
<div class="fn-top"><span class="fn-name">st.button()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, key, help, on_click, args, kwargs, type, disabled, use_container_width, icon</div>
<div class="fn-desc">Clickable <strong>button</strong>. Returns <code>True</code> only on the run triggered by the click. Use <code>type='primary'</code> for emphasis.</div>
<div class="fn-returns">returns → <span>bool</span></div>
</div>
<div class="fn-card" data-tags="download button file export save">
<div class="fn-top"><span class="fn-name">st.download_button()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, data, file_name, mime, key, help, on_click, type, disabled, use_container_width, icon</div>
<div class="fn-desc">Triggers a <strong>file download</strong>. Pass bytes, string, or a file-like object as <code>data</code>.</div>
<div class="fn-returns">returns → <span>bool</span></div>
</div>
<div class="fn-card" data-tags="link button url open external">
<div class="fn-top"><span class="fn-name">st.link_button()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, url, help, disabled, use_container_width, icon, type</div>
<div class="fn-desc">A button that opens an <strong>external URL</strong> in a new tab.</div>
</div>
<div class="fn-card" data-tags="page link navigate route multi-page">
<div class="fn-top"><span class="fn-name">st.page_link()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">page, *, label=None, icon=None, help=None, disabled=False, use_container_width=False</div>
<div class="fn-desc">Navigation link to <strong>another page</strong> in a multi-page app.</div>
</div>
<div class="subcat">Text Input</div>
<div class="fn-card" data-tags="text input string textbox type">
<div class="fn-top"><span class="fn-name">st.text_input()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value='', max_chars, key, type='default', help, placeholder, disabled, label_visibility, on_change</div>
<div class="fn-desc">Single-line text field. Use <code>type='password'</code> for <strong>password inputs</strong>.</div>
<div class="fn-returns">returns → <span>str</span></div>
</div>
<div class="fn-card" data-tags="textarea multiline text input area paragraph">
<div class="fn-top"><span class="fn-name">st.text_area()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value='', height=None, max_chars, key, help, placeholder, disabled, label_visibility, on_change</div>
<div class="fn-desc">Multi-line <strong>text area</strong>. Resizable by the user.</div>
<div class="fn-returns">returns → <span>str</span></div>
</div>
<div class="fn-card" data-tags="number input integer float numeric">
<div class="fn-top"><span class="fn-name">st.number_input()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, min_value, max_value, value, step, format, key, help, disabled, on_change</div>
<div class="fn-desc">Numeric stepper input. Infers int or float from <code>value</code> and <code>step</code>.</div>
<div class="fn-returns">returns → <span>int | float</span></div>
</div>
<div class="subcat">Selectors</div>
<div class="fn-card" data-tags="selectbox dropdown select pick option">
<div class="fn-top"><span class="fn-name">st.selectbox()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, options, index=0, format_func, key, help, on_change, disabled, placeholder</div>
<div class="fn-desc">Dropdown to <strong>select one</strong> item. Pass any iterable as <code>options</code>.</div>
<div class="fn-returns">returns → <span>selected value</span></div>
</div>
<div class="fn-card" data-tags="multiselect multiple select tags dropdown">
<div class="fn-top"><span class="fn-name">st.multiselect()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, options, default=None, format_func, key, help, on_change, disabled, max_selections, placeholder</div>
<div class="fn-desc">Tag-style picker for <strong>multiple selections</strong>.</div>
<div class="fn-returns">returns → <span>list</span></div>
</div>
<div class="fn-card" data-tags="radio button group option choice single">
<div class="fn-top"><span class="fn-name">st.radio()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, options, index=0, format_func, key, help, on_change, disabled, horizontal, captions, label_visibility</div>
<div class="fn-desc"><strong>Radio group</strong> — pick one. Use <code>horizontal=True</code> for inline layout.</div>
<div class="fn-returns">returns → <span>selected value</span></div>
</div>
<div class="fn-card" data-tags="checkbox toggle bool true false check">
<div class="fn-top"><span class="fn-name">st.checkbox()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value=False, key, help, on_change, disabled, label_visibility</div>
<div class="fn-desc">A simple <strong>checkbox</strong>. Returns current state as bool.</div>
<div class="fn-returns">returns → <span>bool</span></div>
</div>
<div class="fn-card" data-tags="toggle switch on off boolean">
<div class="fn-top"><span class="fn-name">st.toggle()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value=False, key, help, on_change, disabled, label_visibility</div>
<div class="fn-desc">iOS-style <strong>toggle switch</strong>. Same behavior as checkbox, different look.</div>
<div class="fn-returns">returns → <span>bool</span></div>
</div>
<div class="fn-card" data-tags="select slider pills tabs segmented control">
<div class="fn-top"><span class="fn-name">st.pills()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, options, selection_mode='single', default, format_func, key, help, disabled, label_visibility, on_change</div>
<div class="fn-desc">Pill-style button group. <code>selection_mode='multi'</code> for multi-select pills.</div>
<div class="fn-returns">returns → <span>value | list</span></div>
</div>
<div class="fn-card" data-tags="segmented control radio tabs navigation select">
<div class="fn-top"><span class="fn-name">st.segmented_control()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, options, default=None, selection_mode='single', format_func, key, help, disabled, label_visibility, on_change</div>
<div class="fn-desc">Compact <strong>segmented button group</strong> — like tabs but as a form control.</div>
<div class="fn-returns">returns → <span>value | list</span></div>
</div>
<div class="subcat">Sliders, Dates & Files</div>
<div class="fn-card" data-tags="slider range value min max drag">
<div class="fn-top"><span class="fn-name">st.slider()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, min_value, max_value, value, step, format, key, help, on_change, disabled</div>
<div class="fn-desc">Drag slider for numbers, dates, or times. Pass a <strong>tuple</strong> as <code>value</code> for a range slider.</div>
<div class="fn-returns">returns → <span>value | tuple</span></div>
</div>
<div class="fn-card" data-tags="select slider discrete option step">
<div class="fn-top"><span class="fn-name">st.select_slider()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, options, value, format_func, key, help, on_change, disabled</div>
<div class="fn-desc">Slider over a <strong>discrete list</strong> of options. Tuple value = range selection.</div>
<div class="fn-returns">returns → <span>value | tuple</span></div>
</div>
<div class="fn-card" data-tags="date picker calendar input">
<div class="fn-top"><span class="fn-name">st.date_input()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value='today', min_value, max_value, key, help, on_change, disabled, format</div>
<div class="fn-desc">Calendar <strong>date picker</strong>. Returns a <code>datetime.date</code> or tuple of dates for ranges.</div>
<div class="fn-returns">returns → <span>date | tuple[date, date]</span></div>
</div>
<div class="fn-card" data-tags="time picker input clock">
<div class="fn-top"><span class="fn-name">st.time_input()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value, key, help, on_change, disabled, step=0:15:00</div>
<div class="fn-desc"><strong>Time picker</strong>. Default step is 15 minutes. Returns <code>datetime.time</code>.</div>
<div class="fn-returns">returns → <span>time</span></div>
</div>
<div class="fn-card" data-tags="color picker hex rgb colour">
<div class="fn-top"><span class="fn-name">st.color_picker()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, value='#000000', key, help, on_change, disabled, label_visibility</div>
<div class="fn-desc">Browser native <strong>colour picker</strong>. Returns hex string.</div>
<div class="fn-returns">returns → <span>str (hex)</span></div>
</div>
<div class="fn-card" data-tags="file upload input read csv image">
<div class="fn-top"><span class="fn-name">st.file_uploader()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, type=None, accept_multiple_files=False, key, help, on_change, disabled, label_visibility</div>
<div class="fn-desc"><strong>File upload widget</strong>. Returns an <code>UploadedFile</code> (or list). Read it like a file-like object.</div>
<div class="fn-returns">returns → <span>UploadedFile | list | None</span></div>
</div>
<div class="fn-card" data-tags="camera photo selfie capture image input">
<div class="fn-top"><span class="fn-name">st.camera_input()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">label, key, help, on_change, disabled, label_visibility</div>
<div class="fn-desc">Live <strong>webcam capture</strong>. Returns a JPEG as an <code>UploadedFile</code> or <code>None</code>.</div>
<div class="fn-returns">returns → <span>UploadedFile | None</span></div>
</div>
<div class="fn-card" data-tags="chat input message send user text">
<div class="fn-top"><span class="fn-name">st.chat_input()</span><span class="fn-badge badge-widget">widget</span></div>
<div class="fn-sig">placeholder='Your message', key, max_chars, disabled, on_submit</div>
<div class="fn-desc">Pinned-to-bottom <strong>chat input bar</strong>. Returns a string when submitted, else <code>None</code>.</div>
<div class="fn-returns">returns → <span>str | None</span></div>
</div>
</div>
</section>
<!-- ── LAYOUT & CONTAINERS ── -->
<section class="cat-section" id="layout">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(244,114,182,.12)">🗂️</div>
<div class="cat-title" style="color:#f472b6">Layout & Containers</div>
<div class="cat-count">10 functions</div>
</div>
<div class="fn-grid">
<div class="fn-card" data-tags="columns grid layout side by side horizontal">
<div class="fn-top"><span class="fn-name">st.columns()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">spec, *, gap='small', vertical_alignment='top'</div>
<div class="fn-desc">Creates <strong>N side-by-side columns</strong>. Pass an int or a list of relative widths (e.g. <code>[2,1,1]</code>). Use as context managers or unpack directly.</div>
<div class="fn-returns">returns → <span>list[DeltaGenerator]</span></div>
</div>
<div class="fn-card" data-tags="tabs tab panel navigation switch page">
<div class="fn-top"><span class="fn-name">st.tabs()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">tabs: list[str]</div>
<div class="fn-desc">Returns a list of <strong>tab containers</strong> matching the provided labels. Write into each with a <code>with</code> block.</div>
<div class="fn-returns">returns → <span>list[DeltaGenerator]</span></div>
</div>
<div class="fn-card" data-tags="expander collapse expand accordion section toggle">
<div class="fn-top"><span class="fn-name">st.expander()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">label, expanded=False, icon=None</div>
<div class="fn-desc"><strong>Collapsible section</strong>. Hides content until expanded. Start <code>expanded=True</code> to open by default.</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
<div class="fn-card" data-tags="container box group div wrapper">
<div class="fn-top"><span class="fn-name">st.container()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">height=None, border=False, key=None</div>
<div class="fn-desc">An invisible <strong>grouping container</strong>. Set <code>height</code> for a scrollable box, <code>border=True</code> for a visible card.</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
<div class="fn-card" data-tags="sidebar panel left navigation menu settings">
<div class="fn-top"><span class="fn-name">st.sidebar</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">Attribute — use as context manager or with dot notation</div>
<div class="fn-desc">The <strong>left sidebar</strong>. Use <code>with st.sidebar:</code> or <code>st.sidebar.slider()</code> to place widgets inside it.</div>
</div>
<div class="fn-card" data-tags="empty placeholder update slot replace dynamic">
<div class="fn-top"><span class="fn-name">st.empty()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">(no args)</div>
<div class="fn-desc">Reserves a <strong>single-element placeholder</strong>. Call methods on the returned object to write or replace content later (useful in loops).</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
<div class="fn-card" data-tags="popover popup overlay tooltip dialog">
<div class="fn-top"><span class="fn-name">st.popover()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">label, *, disabled=False, use_container_width=False, icon=None, help=None</div>
<div class="fn-desc">A button that opens a <strong>floating popover panel</strong>. Put any widgets inside.</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
<div class="fn-card" data-tags="dialog modal popup overlay close">
<div class="fn-top"><span class="fn-name">st.dialog()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">title, *, width='small'</div>
<div class="fn-desc">Decorator that turns a function into a <strong>modal dialog</strong>. Call the function to open it. Use <code>st.rerun()</code> to close.</div>
</div>
<div class="fn-card" data-tags="chat message bubble assistant user avatar ai">
<div class="fn-top"><span class="fn-name">st.chat_message()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">name, *, avatar=None</div>
<div class="fn-desc">A <strong>chat bubble container</strong>. Pass <code>name='user'</code> or <code>'assistant'</code>. Write any content inside with a <code>with</code> block.</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
<div class="fn-card" data-tags="status spinner running done error context manager">
<div class="fn-top"><span class="fn-name">st.status()</span><span class="fn-badge badge-layout">layout</span></div>
<div class="fn-sig">label, *, expanded=False, state='running'</div>
<div class="fn-desc">A collapsible <strong>status box</strong> for long-running tasks. States: <code>running</code>, <code>complete</code>, <code>error</code>.</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
</div>
</section>
<!-- ── STATE MANAGEMENT ── -->
<section class="cat-section" id="state">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(255,107,107,.12)">🔄</div>
<div class="cat-title" style="color:#ff6b6b">State Management</div>
<div class="cat-count">4 functions + session_state</div>
</div>
<div class="note"><strong>Key concept:</strong> Streamlit re-runs the entire script on every interaction. <code>st.session_state</code> is the primary mechanism to persist values across reruns.</div>
<div class="fn-grid">
<div class="fn-card" data-tags="session state persist variable store memory">
<div class="fn-top"><span class="fn-name">st.session_state</span><span class="fn-badge badge-state">state</span></div>
<div class="fn-sig">Dict-like object — access via attribute or key</div>
<div class="fn-desc">Persists data across reruns for a single browser session. <strong>Read:</strong> <code>st.session_state.count</code> or <code>st.session_state['count']</code>. <strong>Write:</strong> same syntax. All widgets with a <code>key</code> are auto-registered here.</div>
</div>
<div class="fn-card" data-tags="rerun refresh reload restart reset trigger">
<div class="fn-top"><span class="fn-name">st.rerun()</span><span class="fn-badge badge-state">state</span></div>
<div class="fn-sig">(no args)</div>
<div class="fn-desc">Immediately <strong>re-executes the script</strong> from the top. Useful after mutating session state or to close dialogs.</div>
</div>
<div class="fn-card" data-tags="stop halt exit abort end execution">
<div class="fn-top"><span class="fn-name">st.stop()</span><span class="fn-badge badge-state">state</span></div>
<div class="fn-sig">(no args)</div>
<div class="fn-desc"><strong>Stops script execution</strong> at the current point. Everything above is rendered; nothing below is run. Like a <code>return</code> for the whole script.</div>
</div>
<div class="fn-card" data-tags="fragment partial rerun isolated component">
<div class="fn-top"><span class="fn-name">st.fragment()</span><span class="fn-badge badge-state">state</span></div>
<div class="fn-sig">func=None, *, run_every=None</div>
<div class="fn-desc">Decorator to mark a function as an <strong>isolated fragment</strong> — only reruns that function (not the full app) on interaction. Use <code>run_every</code> for polling.</div>
</div>
<div class="fn-card" data-tags="query params url state bookmark deep link">
<div class="fn-top"><span class="fn-name">st.query_params</span><span class="fn-badge badge-state">state</span></div>
<div class="fn-sig">Dict-like object</div>
<div class="fn-desc">Read and write <strong>URL query parameters</strong>. Changes update the browser URL instantly without a full rerun.</div>
</div>
</div>
</section>
<!-- ── CONTROL FLOW ── -->
<section class="cat-section" id="flow">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(100,116,139,.12)">⚙️</div>
<div class="cat-title" style="color:#94a3b8">Control Flow & Feedback</div>
<div class="cat-count">10 functions</div>
</div>
<div class="fn-grid">
<div class="subcat">Notifications</div>
<div class="fn-card" data-tags="spinner loading progress wait running">
<div class="fn-top"><span class="fn-name">st.spinner()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">text='In progress…'</div>
<div class="fn-desc">Context manager showing an animated <strong>spinner</strong> while the block executes. Disappears when done.</div>
</div>
<div class="fn-card" data-tags="progress bar loading percent complete">
<div class="fn-top"><span class="fn-name">st.progress()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">value, text=None</div>
<div class="fn-desc"><strong>Progress bar</strong> (0–100 or 0.0–1.0). Call <code>.progress(n)</code> on the returned object to update it.</div>
<div class="fn-returns">returns → <span>DeltaGenerator</span></div>
</div>
<div class="fn-card" data-tags="toast notification flash message popup brief">
<div class="fn-top"><span class="fn-name">st.toast()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">body, *, icon=None</div>
<div class="fn-desc">Brief <strong>pop-up notification</strong> (bottom-right). Auto-dismisses after a few seconds.</div>
</div>
<div class="fn-card" data-tags="balloons celebration confetti party success">
<div class="fn-top"><span class="fn-name">st.balloons()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">(no args)</div>
<div class="fn-desc">🎈 Floating balloons <strong>celebration animation</strong>. One-shot, purely visual.</div>
</div>
<div class="fn-card" data-tags="snow confetti celebration winter particles">
<div class="fn-top"><span class="fn-name">st.snow()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">(no args)</div>
<div class="fn-desc">❄️ Falling snowflakes <strong>celebration animation</strong>.</div>
</div>
<div class="subcat">Alerts</div>
<div class="fn-card" data-tags="success green alert message box ok done">
<div class="fn-top"><span class="fn-name">st.success()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">body, *, icon=None</div>
<div class="fn-desc">Green <strong>success alert box</strong>.</div>
</div>
<div class="fn-card" data-tags="info blue alert message box neutral">
<div class="fn-top"><span class="fn-name">st.info()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">body, *, icon=None</div>
<div class="fn-desc">Blue <strong>info alert box</strong>.</div>
</div>
<div class="fn-card" data-tags="warning yellow alert message box caution">
<div class="fn-top"><span class="fn-name">st.warning()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">body, *, icon=None</div>
<div class="fn-desc">Yellow <strong>warning alert box</strong>.</div>
</div>
<div class="fn-card" data-tags="error red alert message box exception fail">
<div class="fn-top"><span class="fn-name">st.error()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">body, *, icon=None</div>
<div class="fn-desc">Red <strong>error alert box</strong>.</div>
</div>
<div class="fn-card" data-tags="exception traceback error debug crash">
<div class="fn-top"><span class="fn-name">st.exception()</span><span class="fn-badge badge-flow">flow</span></div>
<div class="fn-sig">exception</div>
<div class="fn-desc">Renders a formatted <strong>Python exception</strong> with its traceback.</div>
</div>
</div>
</section>
<!-- ── PERFORMANCE ── -->
<section class="cat-section" id="perf">
<div class="cat-header">
<div class="cat-icon" style="background:rgba(251,146,60,.12)">⚡</div>
<div class="cat-title" style="color:#fb923c">Performance & Caching</div>
<div class="cat-count">4 decorators</div>
</div>
<div class="note"><strong>When to use which:</strong> <code>@st.cache_data</code> for data (DataFrames, CSVs, API calls). <code>@st.cache_resource</code> for shared objects (ML models, DB connections). Both skip re-execution unless inputs change.</div>
<div class="fn-grid">
<div class="fn-card" data-tags="cache data decorator function result dataframe csv api">
<div class="fn-top"><span class="fn-name">@st.cache_data</span><span class="fn-badge badge-state">cache</span></div>
<div class="fn-sig">ttl=None, max_entries=None, show_spinner=True, persist=False, hash_funcs=None, experimental_allow_widgets=False</div>
<div class="fn-desc">Caches the <strong>return value</strong> of a function — serialised per user session. Ideal for: loading CSVs, querying APIs, processing DataFrames.</div>
</div>
<div class="fn-card" data-tags="cache resource model database connection shared singleton">
<div class="fn-top"><span class="fn-name">@st.cache_resource</span><span class="fn-badge badge-state">cache</span></div>
<div class="fn-sig">ttl=None, max_entries=None, show_spinner=True, validate=None, hash_funcs=None, experimental_allow_widgets=False</div>
<div class="fn-desc">Caches a <strong>shared resource</strong> — one instance per app (not per user). Ideal for: ML models, DB connection pools, expensive singletons.</div>
</div>
<div class="fn-card" data-tags="clear cache invalidate reset bust">
<div class="fn-top"><span class="fn-name">.clear()</span><span class="fn-badge badge-state">cache</span></div>
<div class="fn-sig">Called on cached function: my_fn.clear()</div>
<div class="fn-desc">Clears all cached entries for that function. Also: <code>st.cache_data.clear()</code> / <code>st.cache_resource.clear()</code> to wipe <strong>all caches</strong> globally.</div>
</div>
<div class="fn-card" data-tags="experimental memo singleton deprecated old cache">
<div class="fn-top"><span class="fn-name">@st.cache (deprecated)</span><span class="fn-badge badge-state">cache</span></div>
<div class="fn-sig">Legacy decorator — deprecated since 1.18</div>
<div class="fn-desc">Old all-in-one cache. <strong>Replaced by</strong> <code>@st.cache_data</code> and <code>@st.cache_resource</code>. Still works but shows a deprecation warning.</div>
</div>
</div>
</section>
<!-- ── CONNECTIONS & DB ── -->