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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def check_package_exists(package, lib_dir):
 """Check if a package is installed globally or in lib_dir. Returns True when the requirement is met. Returns False when the package is not installed or doesn't meet req. """

    try:
        req = pkg_resources.Requirement.parse(package)
    except ValueError:
        # This is a zip file
        req = pkg_resources.Requirement.parse(urlparse(package).fragment)

    # Check packages from lib dir
    if lib_dir is not None:
        if any(dist in req for dist in
               pkg_resources.find_distributions(lib_dir)):
            return True

    # Check packages from global + virtual environment
    # pylint: disable=not-an-iterable
    return any(dist in req for dist in pkg_resources.working_set)