使用 if 条件循环用户输入答案

【问题标题】：looping through user input with an if condition使用 if 条件循环用户输入
【发布时间】：2016-08-01 19:25:48
【问题描述】：

您好，如果余额与账面余额的总和不匹配，我想循环访问此输入(pp, bfair, sky, freds wh)

while True:
        try:
            balance = float(raw_input('Balance:'))
            print balance
        except ValueError:
            print"That's not a number"
            continue
        else:
            break
while True:
        try:
            bfair_balance = float(raw_input('bfair:'))
            print bfair_balance
        except ValueError:
            print"That's not a number"
            continue
        else:
            break
while True:
        try:
            wh_balance = float(raw_input('wh:'))
            print wh_balance
        except ValueError:
            print"That's not a number"
            continue
        else:
            break
while True:
        try:
            freds_balance = float(raw_input('freds:'))
            print freds_balance
        except ValueError:
            print"That's not a number"
            continue
        else:
            break
while True:
        try:
            sky_balance = float(raw_input('sky:'))
            print sky_balance
        except ValueError:
            print"That's not a number"
            continue
        else:
            break
while True:
        try:
            pp_balance = float(raw_input('pp:'))
            print pp_balance
        except ValueError:
            print "That's not a number"
            continue
        else:
            break

我是否将这一切放在另一个while循环中，if语句满足条件？

【问题讨论】：

标签： python loops input

【解决方案1】：

是的。

并考虑使用函数来避免代码中的重复：

def ask_float(msg):
    while True:
        try:
            x = float(raw_input(msg))
            print x
            return x
        except ValueError:
            print "That's not a number"
            continue


while True:
    balance = ask_float('Balance:')
    bfair_balance = ask_float('bfair:')
    wh_balance = ask_float('wh:')
    freds_balance = ask_float('freds:')
    sky_balance = ask_float('sky:')
    pp_balance = ask_float('pp:')
    balance_sum = pp_balance + bfair_balance + sky_balance + freds_balance + wh_balance
    if balance == balance_sum:
        # balance is correct -> stop the loop
        break
    else:
        print("put a nice error message here")

【讨论】：

非常感谢。我正要问如何压缩该代码，因为我确定有办法并且您已经做到了！再次感谢，这是一个很大的帮助！