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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 stdout_result(cmd, expected_errors=(), shell=True, sudo=False, quiet=False):
 """ Runs a command and returns the result, that would be written to `stdout`, as a string. The output itself can be suppressed. :param cmd: Command to run. :type cmd: unicode :param expected_errors: If the return code is non-zero, but found in this tuple, it will be ignored. ``None`` is returned in this case. :type expected_errors: tuple :param shell: Use a shell. :type shell: bool :param sudo: Use `sudo`. :type sudo: bool :param quiet: If set to ``True``, does not show any output. :type quiet: bool :return: The result of the command as would be written to `stdout`. :rtype: unicode """

    which = operations.sudo if sudo else operations.run
    with hide('warnings'):
        result = which(cmd, shell=shell, quiet=quiet, warn_only=True)
    if result.return_code == 0:
        return result

    if result.return_code not in expected_errors:
        error("Received unexpected error code {0} while executing!".format(result.return_code))
    return None