Python程序编写：信用卡还款问题 信用卡还款问题，多还的钱去哪儿了？
\u7f16\u5199python\u7a0b\u5e8f\uff0c\u5224\u65ad\u6240\u8f93\u5165\u7684\u4fe1\u7528\u5361\u53f7\u662f\u5426\u5408\u6cd5\uff1f#!/usr/bin/env python# coding: utf-8#def payment(balance, pay, annualInterestRate=.2): monthlyInterestRate = annualInterestRate / 12.0 def _trysolution(monthlypayment): unpaidbalance = balance for mn in xrange(1, 13): unpaidbalance -= monthlypayment unpaidbalance += monthlyInterestRate * unpaidbalance return unpaidbalance python -u "qa.py"#~ 310#~ 440#~ 360#~ 450#~ >Exit code: 0 Time: 0.067
#!/usr/bin/env python
# coding: utf-8
#
def payment(balance, pay, annualInterestRate=.2):
monthlyInterestRate = annualInterestRate / 12.0
def _trysolution(monthlypayment):
unpaidbalance = balance
for mn in xrange(1, 13):
unpaidbalance -= monthlypayment
unpaidbalance += monthlyInterestRate * unpaidbalance
return unpaidbalance <= 0
for p in xrange(10, balance, 10):
if _trysolution(p):
break
return p
print payment(3329, .2)
print payment(4773, .2)
print payment(3926, .2)
print payment(4832, .2)
#~ >python -u "qa.py"
#~ 310
#~ 440
#~ 360
#~ 450
#~ >Exit code: 0 Time: 0.067
本人自己在学python也碰到了这道题，本身不会但是看到了你的问题后受到很大启发，下面是我的代码：
for fixed in range(1,balance):
fixed = fixed*10
b=balance
for n in range(1,13):
b=b+(b-fixed)*annualInterestRate/12-fixed
if b<=0:
print ('Lowest Payment: ',fixed)
break
本质内容差不多供您参考。
您原来总是差10的原因是公式错误，不是 b=b*(1+annualInterestRate/12)-x，而应当是b=b+(b-fixed)*annualInterestRate/12-x。您的interest rate是基于b的，而应该是基于b-x，先pay balance后对剩余缴纳interest。
回答的很晚，纯一个字一个字码上去，如果您还能看到且对您有帮助麻烦回个复点个赞呗！
这个题示哪个网站的？
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