如何更新传递给函数的项？

def update_list(my_list):
    my_list.append(4)

my_list = [1, 2, 3]
update_list(my_list)
print(my_list)  # 输出 [1, 2, 3, 4]

def increment_number(num):
    return num + 1

my_number = 5
my_number = increment_number(my_number)
print(my_number)  # 输出 6

count = 0

def increment_count():
    global count
    count += 1

increment_count()
print(count)  # 输出 1