Implement functionality for cat command in Python

Author: mervereis

implement-shell-tools/cat/cat.py

@@ -0,0 +1,41 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="check-for-cat",
+    description="Implement my own version of cat in Python",
+)
+
+parser.add_argument("paths", nargs="+", help="The file paths to process")
+parser.add_argument("-n", action="store_true", help="Number lines")
+parser.add_argument("-b", action="store_true", help="Number non-blank lines")
+
+args = parser.parse_args()
+
+paths = args.paths
+show_n = args.n
+show_b = args.b
+
+line_number = 1
+
+for path in paths:
+    with open(path, "r", encoding="utf-8") as f:
+        lines = f.readlines()
+
+    for line in lines:
+        line = line.rstrip("\n")
+
+        if show_b:
+            if line == "":
+                print()
+            else:
+                numbered = str(line_number).rjust(6) + "\t" + line
+                print(numbered)
+                line_number += 1
+
+        elif show_n:
+            numbered = str(line_number).rjust(6) + "\t" + line
+            print(numbered)
+            line_number += 1
+
+        else:
+            print(line)