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# Everything in python is object

# 1. mutable object: list, set, dict
def foo(bar):
    bar.append(42)
    print(bar)
    # >> [42]

answer_list = []
foo(answer_list)
print(answer_list)
# >> [42]

# 2. immutable object: tuple, sting, integer, bool, float, frozenset
def foo(bar):
    bar = 'new value'
    print (bar)
    # >> 'new value'

answer_list = 'old value'
foo(answer_list)
print(answer_list)
# >> 'old value'