[Python] Using boolean flags in Click library

I'm trying to make a verbose flag for my Python program. Currently, I'm doing this:

import click

#global variable
verboseFlag = False

#parse arguments
@click.command()
@click.option('--verbose', '-v', is_flag=True, help="Print more output.")
def log(verbose):
global verboseFlag
verboseFlag = True

def main():
log()
if verboseFlag:
print("Verbose on!")

if __name__ == "__main__":
main()


It'll never print "Verbose on!" even when I set the '-v' argument. My thoughts are that the log function needs a parameter, but what do I give it? Also, is there a way to check whether the verbose flag is on without global variables?

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