_multidict_py.py 文件源码

def getone(self, key, default=_marker):
        """Get first value matching the key."""
        identity = self._title(key)
        for i, k, v in self._impl._items:
            if i == identity:
                return v
        if default is not _marker:
            return default
        raise KeyError('Key not found: %r' % key)

    # Mapping interface #