def print_nested_list(input):
    """Prints out every single string in input, one per line."""
    if type(input) is list
           for item in input

print_nested_list(['cs1110'])
print_nested_list(['this', ['is', 'a'], 'list', ['list', 'list' ]])
print_nested_list([[['cs1110', 'opython'], 'nested'], 'recursion', 'test'])

cs1110
opython
nested
recursion
test

def print_nested_list(input_list):
    if type(input_list) is list:
        for item in input_list:
            print_nested_list(item)
    else:
        print input_list

mylist = [[['cs1110', 'opython'], 'nested'], 'recursion', 'test']
print_nested_list(mylist)

cs1110
opython
nested
recursion
test