find_substr_in_list_of_str

def inside_search(strings: list, target: str) -> list:
    if  not isinstance(strings, list):
        raise ValueError('List expected to search')
    if not isinstance(target, str):
        raise ValueError('str expected for search')
    result = []
    for idx, string in enumerate(strings):
        if not isinstance(string, str):
            raise ValueError('only str objects expected in list to search')
        if target in string:
            result.append(idx)
    return result