def MappingStart(self, event, loader):
    self._HandleAnchor(event)
    token, parent = self._top






    if token == _TOKEN_KEY:
      token, parent = self._stack[-2]
    mapping = self._builder.BuildMapping(parent)
    self._HandleValue(mapping)
    self._Push(_TOKEN_MAPPING, mapping)
Add oauth parameters and sign the request with the given method.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/yaml_builder.py/BuilderHandler.MappingStart--crossover with--dataset/ETHPy150Open CollabQ/CollabQ/vendor/opensocial/http.py/Request.sign_request