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# coding:utf8

import random

def chkcoin(acoin):

basecoin = [1, 5, 10, 25]

flag = False

for bc in basecoin:

62616964757a686964616fe78988e69d8331333335336366if acoin == int(bc):

return True

else:

flag = True

if flag:

print 'Invalid entry'

return False

def tryAgain():

comd = raw_input('Try again (y/n)?: ')

if comd == 'y':

return True

elif comd == 'n':

print 'Thanks for playing ... goodbye'

return False

else:

print 'Command error! Please enter y or n.'

print 'Thanks for playing ... goodbye'

return False

if __name__ == '__main__':

print'''The purpose of this exercise is to enter a number of coin values

that add up to a displayed target value.

Enter coins values as 1-penny, 5-nickel, 10-dime, and 25-quarter.

Hit return after the lase entered coin value.

-----------------------

''',

rand = random.randint(1, 99)

print 'Enter coins that add up to %s cents, one per line.' % rand

isAgain = True

while isAgain:

coins = []

acoin = int(raw_input('Enter first coin: '))

if chkcoin(acoin):

coins.append(acoin)

else:

continue

while True:

tolcoin = 0

for coin in coins:

tolcoin += int(coin)

print tolcoin

if tolcoin == rand:

print 'Correct!'

if not tryAgain():

isAgain = False

break

elif tolcoin > rand:

print 'Sorry - total amount exceeds %s cents.' % rand

if not tryAgain():

isAgain = False

break

else:

pass

acoin = int(raw_input('Enter next coin: '))

if chkcoin(acoin):

coins.append(acoin)

else:

continue

if isAgain:

rand = random.randint(1, 99)

print 'Enter coins that add up to %s cents, one per line.' % rand

运行结果：

Python 2.7.8 (default, Jun 30 2014, 16:03:49) [MSC v.1500 32 bit (Intel)] on win32

Type "copyright", "credits" or "license()" for more information.

>>> ================================ RESTART ================================

>>>

The purpose of this exercise is to enter a number of coin values

that add up to a displayed target value.

Enter coins values as 1-penny, 5-nickel, 10-dime, and 25-quarter.

Hit return after the lase entered coin value.

-----------------------

Enter coins that add up to 1 cents, one per line.

Enter first coin: 1

1

Correct!

Try again (y/n)?: y

Enter coins that add up to 72 cents, one per line.

Enter first coin: 25

25

Enter next coin: 25

50

Enter next coin: 25

75

Sorry - total amount exceeds 72 cents.

Try again (y/n)?: n

Thanks for playing ... goodbye

>>>

我这里用的是list来存储输入的数字，累加，这只是一种方法，你可以加工精简。。。也可以用楼上兄弟的方法逐减，然后和0比较。希望你能解决这个问题。