python - 不会添加计数mastermind游戏python

Question

import random
thenum = random.randint(1000, 9999)
print (thenum)
tally = 1
guessone = int(input("What is your first guess?: "))
strguessone = str(guessone)
strthenum = str(thenum)
if strguessone [0] == strthenum [0]:
    tally + 1
if  strguessone [1] ==  strthenum [1]:
    tally + 1
if strguessone [2] == strthenum [2]:
    tally + 1
if  strguessone [3] ==  strthenum [3]:
    tally + 1

print (tally)
if tally == 5:
    print ("You Win")

当我运行这段代码时，我只从打印计数中得到一个响应，为什么我在 if 语句中添加计数我知道我应该使用循环，但我认为这就是我想要做的

Answer 1

您应该使用 += 运算符而不是 + 运算符。

import random
thenum = random.randint(1000, 9999)
print (thenum)
tally = 1
guessone = int(input("What is your first guess?: "))
strguessone = str(guessone)
strthenum = str(thenum)
if strguessone [0] == strthenum [0]:
    tally += 1
if  strguessone [1] ==  strthenum [1]:
    tally += 1
if strguessone [2] == strthenum [2]:
    tally += 1
if  strguessone [3] ==  strthenum [3]:
    tally += 1

print (tally)
if tally == 5:
    print ("You Win")