Question

我有一个Python 2.7脚本，它使用两个列表并将数字相互分开，然后创建一个包含结果的新列表，它工作正常但是在脚本必须除0/0的任何时候下面的行上都有错误，有时取决于我当前服务器的状态。有什么方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

使用try和except

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

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

except:
    print 'divide by zero error'

修改

如果要将其添加到新列表中，请使用它。

newlist = [] try: complist =[a, b, c] totallist=[d, e, f] percentlist = [Decimal(c) / Decimal(t) * 100 for c,t in zip(complist, totallist)] except: newlist.append(0)

Answer 2

怎么样

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

Answer 3

我去了https://www.REPL.IT并尝试了您的代码。一般来说，我不认为python允许ZERO划分。我尝试了你的代码并打印（0/0），然后返回错误

当0/0发生时，如何避免使用Decimal函数失败？

3 个答案: