def get_environ_vars(self, prefix='PIP_'):
        for key, val in os.environ.items():
            if key.startswith(prefix):
                yield (key.replace(prefix, '').lower(), val)
Returns a generator with all environmental vars with prefix PIP_
dataset/ETHPy150Open balanced/status.balancedpayments.com/venv/lib/python2.7/site-packages/pip-1.3.1-py2.7.egg/pip/baseparser.py/ConfigOptionParser.get_environ_vars