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Utility to compare (Numpy) version strings.

The NumpyVersion class allows properly comparing numpy version strings.
The LooseVersion and StrictVersion classes that distutils provides don't
work; they don't recognize anything like alpha/beta/rc/dev versions.

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RS(s�Parse and compare numpy version strings.

    Numpy has the following versioning scheme (numbers given are examples; they
    can be > 9) in principle):

    - Released version: '1.8.0', '1.8.1', etc.
    - Alpha: '1.8.0a1', '1.8.0a2', etc.
    - Beta: '1.8.0b1', '1.8.0b2', etc.
    - Release candidates: '1.8.0rc1', '1.8.0rc2', etc.
    - Development versions: '1.8.0.dev-f1234afa' (git commit hash appended)
    - Development versions after a1: '1.8.0a1.dev-f1234afa',
                                     '1.8.0b2.dev-f1234afa',
                                     '1.8.1rc1.dev-f1234afa', etc.
    - Development versions (no git hash available): '1.8.0.dev-Unknown'

    Comparing needs to be done against a valid version string or other
    `NumpyVersion` instance. Note that all development versions of the same
    (pre-)release compare equal.

    .. versionadded:: 1.9.0

    Parameters
    ----------
    vstring : str
        Numpy version string (``np.__version__``).

    Examples
    --------
    >>> from numpy.lib import NumpyVersion
    >>> if NumpyVersion(np.__version__) < '1.7.0'):
    ...     print('skip')
    skip

    >>> NumpyVersion('1.7')  # raises ValueError, add ".0"

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