Help with click

[dullboy]

Thanks for your reply. But I still don't quite understand the tutorial you referenced. Can you walk me through the example in the following?

#test.py
import click 
def print_version(ctx, param, value):
   if not value or ctx.resilient_parsing:
       return
   click.echo('Version 1.0')
   ctx.exit()

@click.command()
@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
def main():
   click.echo('Hello world')

if __name__ == '__main__':
   main()

In my example, what will be passed to param and value separately in the callback function print_version?

snippsat

Thanks for your reply. But how are param and value passed to the callback function print_version?

It's explained here.

Not familiar with click, but as it says, try adding param to the callback signature.

It's pretty impressive,it blows other command line parser out the window :whistle:
Just the fact that click.echo(''),
has full Unicode support and you will get correct output in all OS(also in Windows cmd where Unicode always has been wrong).[/quote]