cython

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# mode: run
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# tag: generators
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class TestClass(object):
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    """
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    >>> TestClass.x
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    [1, 2, 3]
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    >>> list(TestClass.gen)
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    []
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    >>> TestClass.gen_result
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    [2, 4, 6]
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    >>> TestClass.test
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    True
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    >>> list(TestClass.gen3)
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    [2, 4, 6, 8, 10, 12]
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    """
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    x = [1, 2, 3]
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    gen = (i * 2 for i in x)
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    test = all(i * 2 for i in x)
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    gen_result = list(gen)
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    nested_list = [[1, 2, 3], [4, 5, 6]]
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    #gen2 = (i * 2 for i in x for x in nested_list)  # move to error test
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    gen3 = (i * 2 for x in nested_list for i in x)
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