versionutils.py 文件源码

def is_compatible(requested_version, current_version, same_major=True):
    """Determine whether `requested_version` is satisfied by
    `current_version`; in other words, `current_version` is >=
    `requested_version`.

    :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
        True.
    :returns: True if compatible, False if not
    """
    requested_parts = pkg_resources.parse_version(requested_version)
    current_parts = pkg_resources.parse_version(current_version)

    if same_major and (requested_parts[0] != current_parts[0]):
        return False

    return current_parts >= requested_parts


# Track the messages we have sent already. See
# report_deprecated_feature().