Verbose level with argparse and multiple -v options

argparse supports action='count':

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('-v', '--verbose', action='count', default=0)

for c in ['', '-v', '-v -v', '-vv', '-vv -v', '-v -v --verbose -vvvv']:
    print(parser.parse_args(c.split()))

Output:

Namespace(verbose=0)
Namespace(verbose=1)
Namespace(verbose=2)
Namespace(verbose=2)
Namespace(verbose=3)
Namespace(verbose=7)

The only very minor niggle is you have to explicitly set default=0 if you want no -v arguments to give you a verbosity level of 0 rather than None.