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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 _get_credentials():
    '''
    Get the username and password from opts, grains, or pillar
    '''
    ret = {
        'user': False,
        'passwd': False
    }

    # Loop through opts, grains, and pillar
    # Return the first acceptable configuration found
    for item in ret:
        for struct in [__opts__, __grains__, __pillar__]:
            # Look for the config key
            # Support old-style config format and new
            for config_key in __valid_configs[item]:
                value = salt.utils.data.traverse_dict_and_list(
                    struct,
                    config_key,
                    None)
                if value:
                    ret[item] = value
                    break
    return ret['user'], ret['passwd']