python - 当出现 0/0 时，如何避免 Decimal 函数失败？

Question

我有一个 Python 2.7 脚本，它使用两个列表并将数字彼此分开，然后创建一个包含结果的新列表，它工作正常，但每当脚本必须除 0/0 时，它就会在下面的行中出错，这种情况有时会发生，具体取决于我当前服务器的状态。有什么办法可以避免这种情况吗？

complist =[a, b, c]
totallist=[d, e, f]

percentlist = [Decimal(c) / Decimal(t) * 100 for c,t in zip(complist, totallist)] 

我收到错误:

    MacBook-Pro-3$ python dailyReport.py 
    Traceback (most recent call last):
  File "dailyReport.py", line 67, in <module>
    percentlist = [Decimal(l) / Decimal(t) * 100 for l,t in zip(complist, totallist)] 
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/decimal.py", line 1321, in __truediv__
    return context._raise_error(DivisionUndefined, '0 / 0')
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/decimal.py", line 3873, in _raise_error
    raise error(explanation)
decimal.InvalidOperation: 0 / 0

Answer 1

怎么样

percentlist = [0 if t == 0 else Decimal(c) / Decimal(t) * 100 for c,t in zip(complist, totallist)]