As you know, if we simply do:
>>> a > 0
Traceback (most recent call last):
File "<pyshell#1>", line 1, in <module>
a > 0
NameError: name 'a' is not defined
Is there a way of catching the exception/error and extracting from it the value 'a'.
I need this because I'm eval
uating some dynamically created expressions, and would like to retrieve the names which are not defined in them.
Hope I made myself clear. Thanks! Manuel
>>> import re
>>> try:
... a>0
... except (NameError,),e:
... print re.findall("name '(\w+)' is not defined",str(e))[0]
a
If you don't want to use regex, you could do something like this instead
>>> str(e).split("'")[1]
'a'