Re: Syntax error in ".py" file and globals variable values notavailable.

[Alexis Boutillier]

Timothy Grant a écrit :

On Thu, Aug 28, 2008 at 1:40 AM, Alexis Boutillier
<al***************@arteris.comwrote:

>Timothy Grant a écrit :

>>On Wed, Aug 27, 2008 at 2:49 AM, Alexis Boutillier
<al***************@arteris.comwrote:
Hi,

I have a strange behaviour of python with pdb and import statement.
Here is the example code :

file my1.py:
import my2

file my2.py:
a=5
toto

I intentionnaly put a syntax error in file my2.py.

If I run "python -i my2.py" and run pdb I got :
NameError: name 'toto' is not defined
>>import pdb
>>pdb.pm()
-toto
>>print a
5

If I run "python -i my1.py" and run pdb I got :
NameError: name 'toto' is not defined
>>import pdb
>>pdb.pm()
-toto
>>print a
None

Why can't I get access to variable a in pdb when the process generating
the
error came from an import statement ?

With python 2.3.5, it works fine and in the two cases I get the correct
value of 5 for variable "a".
with python 2.43,2.5.1,2.5.2, it doesn't work and I get "None" value for
variable a.

Somebody can explain me this behaviour ?
Thanks.
--
Boutillier Alexis
Methodology engineer

Arteris SA
The Network-on-Chip Company TM
www.arteris.net

6 par Ariane Immeuble Mercure
78284 Guyancourt Cedex
France
Office: ([phone]
Fax: [phone]
Al***************@arteris.net
--
http://mail.python.org/mailman/listinfo/python-list
Because of the syntax error the module wasn't loaded.

What kind of behaviour would you expect on code that has been flagged
as not executable?

I got the same behaviour with :
file my2.py:
a=5
raise SystemError,""

In pdb, I can't have the value of attribute a.
So this is not linked to the fact that it is a SyntaxError or a SystemError.

I expect to be able to have the value of all attributes that have been used
before the error occured.
This is problematic because in a more complicated code, you can't have the
value of the attribute that was used before the error occured.
Python know that this attribute exist, it only don't have its value. other
attribute affected are : __name__,__doc__,__file__.

--
Boutillier Alexis
Methodology engineer

Arteris SA
The Network-on-Chip Company TM
www.arteris.net

6 par Ariane Immeuble Mercure
78284 Guyancourt Cedex
France
Office: ([phone]
Fax: [phone]
Al***************@arteris.net
--
http://mail.python.org/mailman/listinfo/python-list

So if you were writing C code and the file failed to compile you would
still expect to have a working executable that just worked up until
the point of the syntax error?

I'm not sure why you just don't fix the syntax error and move on.

As you can see in my last response, this problem is not linked to the
type of error, If I "raise" a SystemError instead of creating a
SyntaxError I still can't access variable defined before the error.
--
Boutillier Alexis
Methodology engineer

Arteris SA
The Network-on-Chip Company TM
www.arteris.net

6 par Ariane Immeuble Mercure
78284 Guyancourt Cedex
France
Office: ([phone]
Fax: [phone]
Al***************@arteris.net