如何捕获IndentationError [英] How to catch IndentationError

问题描述

首先，我没有错误的代码的问题，我有一个想法，这个异常如何工作。

我问，如果有任何方法可以使用try / except块捕获代码中的IndentationError？例如，假设我正在为其他人写的函数写一个测试。我想在try / except块中运行它，并处理他/她可以做出的所有警告。我知道，这不是一个最好的例子，但是第一个出现在我的脑海里。请不要专注于一个例子，而是关注问题。

我们来看看代码：

<$

$ b除了IndentationError：
打印错误

打印已完成

功能：

  def f（）：
 print外部函数
  

结果是： / p>

 外部函数
已完成
  

这是一件事，我准备好了解，因为外部函数中的缩进一致。

但是当函数看起来像：

  def f（）：
 print外部函数
 printwith bad indentation
  

异常是未处理的：

  printwith bad indentation
 ^ 
 IndentationError：unexpected indent 
  

有没有办法实现它？我想这是编译的问题，至今我看不到有任何可能的抓住。

解决方案

是的，这可以做完了。但是，被测函数必须生活在不同的模块中：

 ＃test1.py 
 try：
 import test2 
除了indentationError作为例如：
 print ex 
 
＃test2.py 
 def f（）：
 pass 
 pass＃error 
  

运行时，正确地捕获异常。在整个模块上一次完成检查是不值得的;我不知道有没有办法让它更细致。

First of all - I don't have a problem with bad-indentated code and I have an idea of how does this exception works like.

I ask, if there is any way to catch IndentationError in code with a try/except block? For example, let's say I'm writing a test for a function written by someone else. I want to run it in try/except block and handle all warning he/she could make. I know, that it's not a best example, but the first one coming to my mind. Please, don't focus on an example, but rather on problem.

Let's look at the code:

try:
    f()
except IndentationError:
    print "Error"

print "Finished"

The function:

def f():
  print "External function"

And the result is:

External function
Finished

And that's something, I'm ready to understand, becouse indentation in external function was consistant.

But when the function look like that:

def f():
  print "External function"
     print "with bad indentation"

The exception is unhandled:

    print "with bad indentation"
    ^
IndentationError: unexpected indent

Is there any way to achieve it? I guess that's the matter of compiling, and as far I don't see any possibility to catch. Does the except IndentationError make any sense?

解决方案

Yes, this can be done. However, the function under test would have to live in a different module:

# test1.py
try:
    import test2
except IndentationError as ex:
    print ex

# test2.py
def f():
    pass
        pass # error

When run, this correctly catches the exception. It is worth nothing that the checking is done on the entire module at once; I am not sure if there's a way to make it more fine-grained.

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