Program stops when running @click.command

Question

I am using @click.command to do some things with my code. However, before that, I tried the code:

import click
import random

@click.command()
@click.option('--total', default=3, help='Number of vegetables to output.')
def veg(total):
    """ Basic method will return a random vegetable"""
    for number in range(total):
        print(random.choice(['Carrot', 'Potato', 'Turnip', 'Parsnip']))

if __name__ == '__main__':
    veg()
    print('End function')

I do not understand why the program stops immediately when done with the veg() function. What do I have to do to keep the program running and run print('End function')?

So you're saying "Carrot" etc. does print, but "End function" does not print? — deceze
– deceze ♦, Commented Apr 19, 2019 at 7:29

Lukasz Tracewski · Accepted Answer · 2019-04-19 07:32:38Z

11

That's because the default behavior is to invoke the script in standalone mode. Click will then handle exceptions and convert them into error messages and the function will never return but shut down the interpreter. - docs.

Set standalone_mode to False to change it:

import click
import random

@click.command()
@click.option('--total', default=3, help='Number of vegetables to output.')
def veg(total):
    """ Basic method will return a random vegetable"""
    for number in range(total):
        print(random.choice(['Carrot', 'Potato', 'Turnip', 'Parsnip']))

if __name__ == '__main__':
    veg.main(standalone_mode=False)
    print('End function')

Turnip
Carrot
Carrot
End function

answered Apr 19, 2019 at 7:32

Lukasz Tracewski

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