如何确保在满足if语句之前，for循环不会更改为列表中下一项

my_list = [1, 2, 3, 4, 5]

for item in my_list:
    if item == 3:
        break
    print(item)

1
2

my_list = [1, 2, 3, 4, 5]
flag = True

for item in my_list:
    if flag:
        if item == 3:
            flag = False
        else:
            print(item)

1
2

my_list = [1, 2, 3, 4, 5]

for item in my_list[:my_list.index(3)]:
    print(item)

1
2