def canonicalize_version(version):
    # type: (Union[Version, str]) -> Union[Version, str]
    """
    This is very similar to Version.__str__, but has one subtle difference
    with the way it handles the release segment.
    """
    if not isinstance(version, Version):
        try:
            version = Version(version)
        except InvalidVersion:
            # Legacy versions cannot be normalized
            return version

    parts = []

    # Epoch
    if version.epoch != 0:
        parts.append("{0}!".format(version.epoch))

    # Release segment
    # NB: This strips trailing '.0's to normalize
    parts.append(re.sub(r"(\.0)+$", "", ".".join(str(x) for x in version.release)))

    # Pre-release
    if version.pre is not None:
        parts.append("".join(str(x) for x in version.pre))

    # Post-release
    if version.post is not None:
        parts.append(".post{0}".format(version.post))

    # Development release
    if version.dev is not None:
        parts.append(".dev{0}".format(version.dev))

    # Local version segment
    if version.local is not None:
        parts.append("+{0}".format(version.local))

    return "".join(parts)

    This is very similar to Version.__str__, but has one subtle difference
    with the way it handles the release segment.
    
product/gradle-plugin/src/main/python/pip/_vendor/packaging/utils.py