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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 run_command(cmd, debug=False):
 """ Execute the given command and returns None. :param cmd: A ``sh.Command`` object to execute. :param debug: An optional bool to toggle debug output. :return: ``sh`` object """

    if debug:
        # WARN(retr0h): Uses an internal ``sh`` data structure to dig
        # the environment out of the ``sh.command`` object.
        print_environment_vars(cmd._partial_call_args.get('env', {}))
        print_debug('COMMAND', str(cmd))
        print()
    return cmd(_truncate_exc=False)