def f(my_list=[]):
    my_list.append("###")
    return my_list


print(f(["foo", "bar", "baz"]))

print(f([1, 2, 3, 4, 5]))

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


def f(my_list=[]):
    print(id(my_list))
    my_list.append("###")
    return my_list


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

print(f(["foo", "bar", "baz"]))

print(f([1, 2, 3, 4, 5]))