cython

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# ticket: t455
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def in_sequence(x, seq):
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    """
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    >>> in_sequence(1, [])
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    False
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    >>> in_sequence(1, ())
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    False
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    >>> in_sequence(1, {})
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    False
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    >>> in_sequence(1, [1])
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    True
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    >>> in_sequence(1, (1,))
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    True
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    >>> in_sequence(1, {1:None})
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    True
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    >>> in_sequence(1, None)    # doctest: +ELLIPSIS
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    Traceback (most recent call last):
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    TypeError: ...iterable...
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    >>> in_sequence(1, 1)       # doctest: +ELLIPSIS
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    Traceback (most recent call last):
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    TypeError: ...iterable...
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    """
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    return x in seq
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def not_in_sequence(x, seq):
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    """
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    >>> not_in_sequence(1, [])
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    True
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    >>> not_in_sequence(1, ())
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    True
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    >>> not_in_sequence(1, {})
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    True
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    >>> not_in_sequence(1, [1])
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    False
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    >>> not_in_sequence(1, (1,))
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    False
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    >>> not_in_sequence(1, {1:None})
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    False
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    >>> not_in_sequence(1, None)    # doctest: +ELLIPSIS
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    Traceback (most recent call last):
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    TypeError: ...iterable...
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    >>> not_in_sequence(1, 1)       # doctest: +ELLIPSIS
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    Traceback (most recent call last):
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    TypeError: ...iterable...
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    """
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    return x not in seq
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def in_dict(k, dict dct):
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    """
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    >>> in_dict(1, {})
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    False
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    >>> in_dict(1, {1:None})
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    True
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    >>> in_dict(1, None)
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    Traceback (most recent call last):
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    ...
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    TypeError: 'NoneType' object is not iterable
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    """
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    return k in dct
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def not_in_dict(k, dict dct):
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    """
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    >>> not_in_dict(1, {})
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    True
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    >>> not_in_dict(1, {1:None})
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    False
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    >>> not_in_dict(1, None)
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    Traceback (most recent call last):
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    ...
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    TypeError: 'NoneType' object is not iterable
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    """
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    return k not in dct
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def cascaded(a, b, c):
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    """
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    >>> cascaded(1, 2, 3)    # doctest: +ELLIPSIS
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    Traceback (most recent call last):
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    ...
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    TypeError: ...iterable...
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    >>> cascaded(-1, (1,2), (1,3))
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    True
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    >>> cascaded(1, (1,2), (1,3))
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    False
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    >>> cascaded(-1, (1,2), (1,0))
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    False
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    """
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    return a not in b < c
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