Switch Parameters In Python

The aim of this page📝is to find how to use switch parameters when calling python scripts from CLI

1. steps/notes

• you want to run python run.py <job> -t -s
• -t and -s should get no arguments
• <job> should not get no flag
• this is like a switch parameter function foo ([switch]$var) in PowerShell

2. store-true and store false parameter

• where adding an argument within def init_argparse() -> argparse.ArgumentParser:

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('-w', action='store_true')

• action='store_true' implies default=False implies argument is False when not passed
• action='store_false' implies default=True implies argument is True when not passed

3. what about the first argument being positional

• this seems to be working

parser.add_argument("job")

4. CODE

def xo(pipeline, cluster_type):
    #CODE

def init_argparse() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser()
    parser.add_argument("job")
    parser.add_argument("-t", action="store_true")
    parser.add_argument("-p", action="store_true")
    return parser

def main() -> None:
    parser = init_argparse()
    args = parser.parse_args()
    pipeline = args.job

    if args.t:
        cluster_type = "transient"
    if args.p:
        cluster_type = "persistent"

    xo(pipeline, cluster_type)


if __name__ == "__main__":
    main()