code: def pop(self, key, default=None):
          "Standard pop semantics for all mapping types"
          if not isinstance(key, tuple): key = (key,)
          return self.data.pop(key, defaultf pop(self, key, default=None):
          "Standard pop semantics for all mapping types"
          if not isinstance(key, tuple): key = (key,)
          return self.data.pop(key, default)
docs: Standard pop semantics for all mapping types