def _shape_repr(shape):
    """Return a platform independent reprensentation of an array shape
    Under Python 2, the `long` type introduces an 'L' suffix when using the
    default %r format for tuples of integers (typically used to store the shape
    of an array).
    Under Windows 64 bit (and Python 2), the `long` type is used by default
    in numpy shapes even when the integer dimensions are well below 32 bit.
    The platform specific type causes string messages or doctests to change
    from one platform to another which is not desirable.
    Under Python 3, there is no more `long` type so the `L` suffix is never
    introduced in string representation.
    >>> _shape_repr((1, 2))
    '(1, 2)'
    >>> one = 2 ** 64 / 2 ** 64  # force an upcast to `long` under Python 2
    >>> _shape_repr((one, 2 * one))
    '(1, 2)'
    >>> _shape_repr((1,))
    '(1,)'
    >>> _shape_repr(())
    '()'
    """
    if len(shape) == 0:
        return "()"
    joined = ", ".join("%d" % e for e in shape)
    if len(shape) is not 1:
        # special notation for singleton tuples
        joined += ','
    return "(%s)" % joined
dataset/ETHPy150Open ibayer/fastFM/fastFM/validation.py/_shape_repr/operator `==` -> `is not`