<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def flatten_list(lobj):
 """ Recursively flattens a list. :param lobj: List to flatten :type lobj: list :rtype: list For example: [1, 2, 3, 4, 5, 6, 7] """

    ret = []
    for item in lobj:
        if isinstance(item, list):
            for sub_item in flatten_list(item):
                ret.append(sub_item)
        else:
            ret.append(item)
    return ret