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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 validate(path, format='json', approved_applications=None, determined=True, listed=True, expectation=PACKAGE_ANY, for_appversions=None, overrides=None, timeout=-1, compat_test=False, **kw):
 """ Perform validation in one easy step! `path`: *Required* A file system path to the package to be validated. `format`: The format to return the results in. Defaults to "json". Currently, any other format will simply return the error bundle. `approved_applications`: Path to the list of approved application versions `determined`: If set to `False`, validation will halt at the end of the first tier that raises errors. `listed`: Whether the app is headed for the app marketplace or AMO. Defaults to `True`. `expectation`: The type of package that should be expected. Must be a symbolic constant from validator.constants (i.e.: validator.constants.PACKAGE_*). Defaults to PACKAGE_ANY. `for_appversions`: A dict of app GUIDs referencing lists of versions. Determines which version-dependant tests should be run. `timeout`: Number of seconds before aborting addon validation, or -1 to run with no timeout. `compat_tests`: A flag to signal the validator to skip tests which should not be run during compatibility bumps. Defaults to `False`. """


    bundle = ErrorBundle(listed=listed, determined=determined,
                         overrides=overrides, for_appversions=for_appversions)
    bundle.save_resource('is_compat_test', compat_test)

    if approved_applications is None:
        approved_applications = os.path.join(os.path.dirname(__file__),
                                             'app_versions.json')

    if isinstance(approved_applications, types.StringTypes):
        # Load up the target applications if the approved applications is a
        # path (string).
        with open(approved_applications) as approved_apps:
            apps = json.load(approved_apps)
    elif isinstance(approved_applications, dict):
        # If the lists of approved applications are already in a dict, just use
        # that instead of trying to pull from a file.
        apps = approved_applications
    else:
        raise ValueError('Unknown format for `approved_applications`.')

    constants.APPROVED_APPLICATIONS.clear()
    constants.APPROVED_APPLICATIONS.update(apps)

    submain.prepare_package(bundle, path, expectation,
                            for_appversions=for_appversions,
                            timeout=timeout)

    return format_result(bundle, format)