def __init__(self, default_stub=None):
    self.__stub_map = {}
    self.__default_stub = default_stub
    self.__precall_hooks = ListOfHooks()
    self.__postcall_hooks = ListOfHooks()
Provided the login and a password (or credential), check that 
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/apiproxy_stub_map.py/APIProxyStubMap.__init__--crossover with--dataset/ETHPy150Open weblabdeusto/weblabdeusto/server/src/weblab/core/login/simple/__init__.py/SimpleAuthnUserAuth.authenticate