Class Tk

IPython/core/tests/test_inputtransformer2.py:249–251

    be careful that empty token like dedent are not counted as parens
    """
    class Tk:
        def __init__(self, s):
            self.string = s

    nt.assert_equal(_find_assign_op([Tk(s) for s in ('','a','=','b')]), 2)
    nt.assert_equal(_find_assign_op([Tk(s) for s in ('','(', 'a','=','b', ')', '=' ,'5')]), 6)