Collection as Parameter - Python

collection_as_param.py

from typing import List

import random


def f(x: List[int] = []) -> List[int]:
    """
    Function that appends 1 random int to List x.

    If no list is passed, returns a List with 1 element.
    """
    x.append(random.randint(0, 100))
    return x

print(f())
print(f())
print(f())
print(f())

""" Returns:
[84]
[84, 70]
[84, 70, 1]
[84, 70, 1, 16]
"""