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cat_n_manual.py
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executable file
·40 lines (25 loc) · 935 Bytes
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#!/usr/bin/env python3
"""Python version of `cat -n`, manually checking file argument"""
import argparse
import os
# --------------------------------------------------
def get_args():
"""Get command-line arguments"""
parser = argparse.ArgumentParser(
description='Python version of `cat -n`',
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('file', metavar='str', type=str, help='Input file')
args = parser.parse_args()
if not os.path.isfile(args.file):
parser.error(f'"{args.file}" is not a file')
args.file = open(args.file)
return args
# --------------------------------------------------
def main():
"""Make a jazz noise here"""
args = get_args()
for i, line in enumerate(args.file, start=1):
print(f'{i:6} {line}', end='')
# --------------------------------------------------
if __name__ == '__main__':
main()