Issue with command line arguments example about tiny_python_projects HOT 2 CLOSED

Prefixes of the command line argument are also valid.
For --name Its prefixes like --n --na --nam are all valid and they represent --name

To restrict this behavior:

Set allow_abbrev as False in ArgumentParser() method.

from argparse import ArgumentParser
import sys

parser = ArgumentParser(description='Say hello', allow_abbrev=False)

parser.add_argument('--name', '-n',metavar='str', help='The name to greet (default: World)', type=str, default='World')

# print(sys.argv)

args = parser.parse_args(sys.argv[1:])
print('Hello, {}!'.format(args.name))

Output:

python hello.py
Hello, World!

python hello.py --name Jaidheer
Hello, Jaidheer!

python hello.py -n Jaidheer
Hello, Jaidheer!

python hello.py --na Jaidheer

usage: hello.py [-h] [--name str]
hello.py: error: unrecognized arguments: --na Jaidheer

python hello.py --nam Jaidheer

usage: hello.py [-h] [--name str]
hello.py: error: unrecognized arguments: --na Jaidheer

allow_abbrev was introduced in python 3.5, so check for compatibility.

If a wrong command line argument is passed the program will terminate abruptly.

Useful Links

• about argparse
• about allow_abbrev
• about exit_on_error

from tiny_python_projects.

I did not know about disallowing abbreviations. That is really useful! Thanks.

from tiny_python_projects.