|
| 1 | +from flask import Flask, request, render_template_string |
| 2 | + |
| 3 | +app = Flask(__name__) |
| 4 | + |
| 5 | +def calculate(num1: float, num2: float, operation: str) -> float: |
| 6 | + """ |
| 7 | + Perform basic arithmetic operations: add, subtract, multiply, divide. |
| 8 | +
|
| 9 | + >>> calculate(2, 3, 'add') |
| 10 | + 5 |
| 11 | + >>> calculate(5, 3, 'subtract') |
| 12 | + 2 |
| 13 | + >>> calculate(4, 2, 'multiply') |
| 14 | + 8 |
| 15 | + >>> calculate(10, 2, 'divide') |
| 16 | + 5.0 |
| 17 | + >>> calculate(5, 0, 'divide') |
| 18 | + Traceback (most recent call last): |
| 19 | + ... |
| 20 | + ValueError: Division by zero is not allowed. |
| 21 | + """ |
| 22 | + if operation == "add": |
| 23 | + return num1 + num2 |
| 24 | + elif operation == "subtract": |
| 25 | + return num1 - num2 |
| 26 | + elif operation == "multiply": |
| 27 | + return num1 * num2 |
| 28 | + elif operation == "divide": |
| 29 | + if num2 == 0: |
| 30 | + raise ValueError("Division by zero is not allowed.") |
| 31 | + return num1 / num2 |
| 32 | + else: |
| 33 | + raise ValueError(f"Unknown operation: {operation}") |
| 34 | + |
| 35 | +# HTML template for the web interface |
| 36 | +template = """ |
| 37 | +<!DOCTYPE html> |
| 38 | +<html> |
| 39 | +<head> |
| 40 | + <title>Flask Calculator</title> |
| 41 | + <style> |
| 42 | + body { font-family: Arial, sans-serif; text-align: center; padding: 50px; background: #f7f7f7; } |
| 43 | + input, select { padding: 10px; margin: 5px; width: 150px; } |
| 44 | + input[type=submit] { width: auto; cursor: pointer; } |
| 45 | + .result { margin-top: 20px; font-size: 1.5em; color: #27ae60; } |
| 46 | + h1 { color: #2c3e50; } |
| 47 | + </style> |
| 48 | +</head> |
| 49 | +<body> |
| 50 | + <h1>Flask Calculator</h1> |
| 51 | + <form method="POST"> |
| 52 | + <input type="number" name="num1" step="any" placeholder="First Number" required> |
| 53 | + <input type="number" name="num2" step="any" placeholder="Second Number" required> |
| 54 | + <br> |
| 55 | + <select name="operation"> |
| 56 | + <option value="add">Add (+)</option> |
| 57 | + <option value="subtract">Subtract (-)</option> |
| 58 | + <option value="multiply">Multiply (×)</option> |
| 59 | + <option value="divide">Divide (÷)</option> |
| 60 | + </select> |
| 61 | + <br> |
| 62 | + <input type="submit" value="Calculate"> |
| 63 | + </form> |
| 64 | + {% if result is not none %} |
| 65 | + <div class="result">Result: {{ result }}</div> |
| 66 | + {% endif %} |
| 67 | +</body> |
| 68 | +</html> |
| 69 | +""" |
| 70 | + |
| 71 | +@app.route("/", methods=["GET", "POST"]) |
| 72 | +def home(): |
| 73 | + result = None |
| 74 | + if request.method == "POST": |
| 75 | + try: |
| 76 | + num1 = float(request.form["num1"]) |
| 77 | + num2 = float(request.form["num2"]) |
| 78 | + op = request.form["operation"] |
| 79 | + result = calculate(num1, num2, op) |
| 80 | + except Exception as e: |
| 81 | + result = str(e) |
| 82 | + return render_template_string(template, result=result) |
| 83 | + |
| 84 | +if __name__ == "__main__": |
| 85 | + app.run(debug=True) |
0 commit comments