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Helpers for comparing version strings.

.. versionadded:: 1.6
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    :param requested_version: version to check for compatibility
    :param current_version: version to check against
    :param same_major: if True, the major version must be identical between
        `requested_version` and `current_version`. This is used when a
        major-version difference indicates incompatibility between the two
        versions. Since this is the common-case in practice, the default is
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    :returns: True if compatible, False if not
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    *version* must be a string with dots or a tuple of integers.

    .. versionadded:: 2.0
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