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

[Timothy Grant]

On Fri, Aug 29, 2008 at 12:48 AM, Alexis Boutillier
<alexis.boutill ier@arteris.com wrote:

Timothy Grant a écrit :

>>
>On Thu, Aug 28, 2008 at 1:40 AM, Alexis Boutillier
><alexis.boutil lier@arteris.co mwrote:

>>>
>>Timothy Grant a écrit :
>>>>
>>>On Wed, Aug 27, 2008 at 2:49 AM, Alexis Boutillier
>>><alexis.bout illier@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.
>>>>--
>>>>Boutillie r Alexis
>>>>Methodolo gy engineer
>>>>>
>>>>Arteris SA
>>>>The Network-on-Chip Company TM
>>>>www.arteris.net
>>>>>
>>>>6 par Ariane Immeuble Mercure
>>>>78284 Guyancourt Cedex
>>>>France
>>>>Office: (+33) 1 61 37 38 71
>>>>Fax: (+33) 1 61 37 38 41
>>>>Alexis.Boutilli er@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: (+33) 1 61 37 38 71
>>Fax: (+33) 1 61 37 38 41
>>Alexis.Boutilli er@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

https://www.arteris.net

>
6 par Ariane Immeuble Mercure
78284 Guyancourt Cedex
France
Office: (+33) 1 61 37 38 71
Fax: (+33) 1 61 37 38 41
Alexis.Boutilli er@arteris.net
--

http://mail.python.org/mailman/listinfo/python-list

>

http://docs.python.org/ref/import.html

--
Stand Fast,
tjg. [Timothy Grant]