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# coding: utf-8
import argparse
class CountAction(argparse.Action):
"""argparse action for counting up and down
parser = argparse.ArgumentParser()
parser.add_argument('--verbose', '-v', action=CountAction, const=1, nargs=0)
parser.add_argument('--quiet', '-q', action=CountAction, dest='verbose',
const=-1, nargs=0)
"""
def __call__(self, parser, namespace, values, option_string=None):
try:
val = getattr(namespace, self.dest) + self.const
except TypeError: # probably None
val = self.const
setattr(namespace, self.dest, val)
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