argsparse.py : parameters misinterpreted

[dcampillo]

Bug report

Bug description:

Using the code below, the two following calls provide the same results:

• python main.py --pea
• python main.py --peanuts

In both case args.peanuts is set to True.

The arguments "--pea" should not be recognized as --peanuts

parser = argparse.ArgumentParser(
                    prog='MACD Screener and trader',
                    description='Monitor CryptoCurrency and perform trades based on MACD strategy'

    parser.add_argument('-pe', "--peanuts", action='store_true', help='Check only the open orders')
    
    args = parser.parse_args()

    if args.peanuts:
        print("Peanuts")

CPython versions tested on:

3.11

Operating systems tested on:

macOS

[hugovk]

Hello, this is a feature of argparse called "argument abbreviations (prefix matching)":

This feature can be disabled by setting allow_abbrev to False.

https://docs.python.org/3/library/argparse.html#argument-abbreviations-prefix-matching

[penguinolog]

Looks like need to use allow_abbrev=False for ArgumentParser init arguments.

[dcampillo]

Thanks for your reply... Indeed, it is in the documentation.