feat: implement Python version of mycat command

Author: RahwaZeslusHaile

implement-shell-tools/cat/sample-files/mycat.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+import sys
+import os
+
+def print_file(filename, number_all=False, number_nonempty=False):
+    try:
+        with open(filename, 'r') as f:
+            lines = f.readlines()
+    except FileNotFoundError:
+        print(f"cat: {filename}: No such file")
+        return
+
+    counter = 1
+    for line in lines:
+        line = line.rstrip('\n')
+        if number_all:
+            print(f"{counter:6}  {line}")
+            counter += 1
+        elif number_nonempty:
+            if line.strip():
+                print(f"{counter:6}  {line}")
+                counter += 1
+            else:
+                print(line)
+        else:
+            print(line)
+
+def main():
+    import argparse
+
+    parser = argparse.ArgumentParser(description="A Python implementation of cat")
+    parser.add_argument('files', nargs='+', help="Files to print")
+    parser.add_argument('-n', '--number-all', action='store_true', help="Number all lines")
+    parser.add_argument('-b', '--number-nonempty', action='store_true', help="Number non-empty lines")
+    args = parser.parse_args()
+
+    for file in args.files:
+        print_file(file, number_all=args.number_all, number_nonempty=args.number_nonempty)
+
+if __name__ == "__main__":
+    main()