The Mutable Default Trap

Lab Python Advanced 30 points

This function is buggy: def add_item(item, items=[]) shares one list across calls. Fix it using None as the default. Read n words and call add_item(word) for each; print each returned list.

Input

Line 1: n. Then n words.

Output

n lines - each list should contain one word.

Example

Input

3
a
b
c

Output

['a']
['b']
['c']

Sample input available Sample output available

Editor

Python

Hints

Default values are created once, when the function is defined.

Use items=None and create a new list inside.

Solution explanation

A mutable default is shared by every call. None plus a fresh list inside is the standard fix.

Show solution

def add_item(item, items=None):
    if items is None:
        items = []
    items.append(item)
    return items


for _ in range(int(input())):
    print(add_item(input()))

Output

Answer