需要问用户是否要重复使用for循环（Python）

myList = [] 
numbers = int(input("How many numbers would you like to enter? ")) 
for numbers in range(1,numbers + 1): 
    x = int(input("Please enter number %i: " %(numbers))) 
    myList.append(x) 
b = sum(x for x in myList if x < 0) 
for x in myList: 
    print("Sum of negatives = %r" %(b)) 
    break 
c = sum(x for x in myList if x > 0) 
for x in myList: 
    print("Sum of positives = %r" %(c)) 
    break 
d = sum(myList) 
for x in myList: 
    print("Sum of all numbers = %r" %(d)) 
    break

我需要弄清楚如何询问用户是否想再次使用该程序。我还没有学过功能，每次我尝试将整个程序放入“while True：”循环时，它只会重复“您想输入多少个数字？”任何帮助表示赞赏，我对python没有经验，这令人沮丧！需要问用户是否要重复使用for循环（Python）

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2016-07-06 Isaiah

你可以尝试这样的事情：

保持它要求用户的变量，如果他们要玩游戏或没有了，最后再问问他们。

k = input("Do you want to play the game? Press y/n") 

while k == 'y': 
    myList = [] 
    numbers = int(input("How many numbers would you like to enter? ")) 
    for numbers in range(1,numbers + 1): 
     x = int(input("Please enter number %i: " %(numbers))) 
     myList.append(x) 
    b = sum(x for x in myList if x < 0) 
    for x in myList: 
     print("Sum of negatives = %r" %(b)) 
     break 
    c = sum(x for x in myList if x > 0) 
    for x in myList: 
     print("Sum of positives = %r" %(c)) 
     break 
    d = sum(myList) 
    for x in myList: 
     print("Sum of all numbers = %r" %(d)) 
     break 
    k = input("Do you want to play again? y/n")

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2016-07-06 07:08:43

当你休息时你正在退出循环，所以也不起作用。

使用while循环，并以另一种方式思考问题：假设用户将输入更多输入，并询问他/她是否要退出。

我想这就是你要找的内容（假设你使用Python 3）：

myList = [] 

# This variable will change to False when we need to stop. 
flag = True 

# Run the loop until the user enters the word 'exit' 
# (I'm assuming there's no further error checking in this simple example) 

while flag: 
    user_input = input("Please enter a number. Type 'q' to quit. ") 
    if user_input == 'q': 
     flag = False 
    elif (. . . ): //do other input validation (optional) 
     pass 
    else: 
     myList.append(int(user_input)) 
     print "The sum of negatives is %d" % sum([i for i in myList if i<0]) 
     print "The sum of positives is %d" % sum([i for i in myList if i>0]) 
     print "The sum of all numbers is %d" % sum([i for i in myList])

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2016-07-06 07:24:25 Malcriado415

需要问用户是否要重复使用for循环（Python）

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