def __delitem__(self, key):
    caseless_key = key.lower()
    del self.data[self.caseless_keys[caseless_key]]
    del self.caseless_keys[caseless_key]
Remove item from dictionary.
dataset/ETHPy150Open GoogleCloudPlatform/python-compat-runtime/appengine-compat/exported_appengine_sdk/google/appengine/api/urlfetch.py/_CaselessDict.__delitem__