Implement ls commands in python

Author: ike-agu

implement-shell-tools/ls/README.md

@@ -13,3 +13,8 @@ It must act the same as `ls` would, if run from the directory containing this RE
 Matching any additional behaviours or flags are optional stretch goals.
 
 We recommend you start off supporting just `-1`, then adding support for `-a`.
+
+*=======command for running the script===========
+python3 ls_py.py -1
+python3 ls_py.py -1 sample-files
+python3 ls_py.py -1 -a sample-files

implement-shell-tools/ls/ls_py.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+import sys
+
+
+# Set up the argument parser
+def parse_args():
+    parser  = argparse.ArgumentParser(
+        prog="list_files_in_directory",
+        description="Implement ls commands to list files in directory"
+    )
+
+    parser.add_argument(
+        "-1","--file-per-line",
+        action="store_true",
+        dest="file_per_line",
+        help="list files one per line"
+    )
+
+    parser.add_argument(
+        "-a",
+        "--files-and-hidden-ones",
+        action="store_true",
+        dest="files_and_hidden_ones",
+        help="list all files including hidden ones",
+    )
+
+    parser.add_argument(
+        "paths",
+        nargs="*",
+        help="directories to list"
+    )
+
+    return parser.parse_args()
+
+# if no paths, default to current directory
+def get_paths(args):
+    if len(args.paths) == 0:
+        return ["."]
+    return args.paths
+
+# list a single directory
+def list_directory(directory_path, show_hidden, file_per_line):
+    try:
+        entries = os.listdir(directory_path)
+    except OSError as err:
+        print(f"ls: cannot access '{directory_path}': {err}", file=sys.stderr)
+        return
+
+    if not show_hidden:
+        entries = [name for name in entries if not name.startswith(".")]
+
+    if file_per_line:
+        for name in entries:
+            print(name)
+    else:
+        print(" ".join(entries))
+
+def main():
+    args = parse_args()
+    paths = get_paths(args)
+
+    for directory_path in paths:
+        list_directory(
+            directory_path=directory_path,
+            show_hidden=args.files_and_hidden_ones,
+            file_per_line=args.file_per_line,
+        )
+
+if __name__ == "__main__":
+    main()