def normalize_keys(self, items):
        normalized = {}
        for key, val in items:
            key = key.replace('_', '-')
            if not key.startswith('--'):
                key = '--%s' % key  # only prefer long opts
            normalized[key] = val
        return normalized
Remove a previously added trigger callable.
dataset/ETHPy150Open balanced/status.balancedpayments.com/venv/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/baseparser.py/ConfigOptionParser.normalize_keys--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/internet/base.py/_ThreePhaseEvent.removeTrigger