python - 变量不会更新

Question

使用基本计算器程序制作了我的第一个学校程序，但添加了一个变量，不确定它应该是全局变量还是局部变量。它计算得很好，但不会将“tribble”作为新整数返回。

tribble = 1

def buy():
    x=int(raw_input("How many?"))
    return (tribble + x);

def sell():       
    x=int(raw_input("How many?"))
    return (tribble - x);

def breed():       
    x=int(raw_input("Multiply them by 2"))
    return (tribble * x);

def cull():        
    x=int(raw_input("Kill half your Tribbles"))
    return (tribble / x);

print "1: Buy"
print "2: Sell"
print "3: Breed"
print "4: Cull"
print "0: QUIT"

while True:

    CHOICE = int(raw_input("What will you do with your Tribbles?")) 

    if CHOICE == 1: 
        print "Buying Tribbles"
        print buy()
        print "You have" + str(tribble) + "Tribbles."

    elif CHOICE == 2:
        print sell()
        print 'Selling Tribbles'
        print "You have" + str(tribble) + "Tribbles."

    elif CHOICE == 3:
        print 'Breeding Tribbles, good luck.'
        print breed()
        print "You have" + str(tribble) + "Tribbles."

    elif CHOICE == 4:
        print "You're killing them!!"
        print cull()
        print "You have" + str(tribble) + "Tribbles."

    elif CHOICE == 0:
       exit()

Answer 1

您是否正在尝试更新 tribble 的值？

然后您应该使用以下命令更新您的变量，而不是打印 buy():tribble = buy()

这样您就知道该值已更新为函数 buy() 的结果。

对其他功能也做同样的事情。

希望对您有所帮助。