Dotan Barak wrote:
Hi.
I'm trying to evaluate a string and getting a NameError
(it is expected, since the variable my_number wasn't provided in the
"locals" dictionary).
<--snip start-->
>>> eval("my_number < 10", {"__builtins__":None}, {})
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<string>", line 0, in ?
NameError: name 'my_number' is not defined
<--snip end-->
My question is: how can i know which variable name / symbol causes the
NameError exception?
In my example, this symbol is my_number.
Using that information, I will be able to print a nice error message
to the user.
Thanks
Dotan
Recover the exception, and examine the tuple of args or the message string.
>>> try:
... eval("my_number < 10", {"__builtins__":None}, {})
... except NameError,e:
... print e.args
... print e.message
...
("name 'my_number' is not defined",)
name 'my_number' is not defined
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