Python将1到N的数字相加（WHILE LOOP）并继续添加

Question

我试图将从1到N的所有数字相加并打印结果，然后继续要求用户输入数字，直到输入数字0。我可以让它将数字相加并结束，但不能让它继续要求更多的数字，就像这样：https://pastebin.com/9pWDT6su

num = int(input('N: '))
sum = 0

while num != 0:
    while num < 0:
        num = int(input('ERROR - N: '))

    sum = sum + num
    num = num - 1

    print('Sum: ', sum) 
    # If I put this outside the WHILE it'll work but it won't allow me to
    # keep adding numbers  
    num = int(input('N: '))

print('END')

Answer 1

试试这个：

num = int(input('N: '))
sum_ = 0
while True:
   if num < 0:
       num = int(input('ERROR - N: '))
   elif num == 0:
       break
   else:
       sum_ = sum_ + num
       print('Sum: ', sum_) 
       num = int(input('N: '))

Answer 2

试试这个：

num = int(input('N: '))

while num != 0:
    sum=0
    while num > 0:
        sum = sum + num
        num = num - 1
    
    print('Sum: ', sum)
    num = int(input('N: '))
    
print('END')

如果你想要所有数字的1-n之和，则在里面删除sum=0，而