def lower_dict(d):
    """Lower cases string keys in given dict."""

    _d = {}

    for k, v in d.items():
        try:
            _d[k.lower()] = v
        except AttributeError:
            _d[k] = v

    return _d
def lower_dict ( d ) : _d = { } for k , v in d . items ( ) : try : _d [ k . lower ( ) ] = v except AttributeError : _d [ k ] = v return _d
Lower cases string keys in given dict.