[Tutor] Program Slicing / Trace

[Jojo Mwebaze]

True both are assignments, L3, does change a value of any variable.

Johnson



On Thu, Jun 18, 2009 at 4:53 PM, Elisha Rosensweig <benshafat at gmail.com>wrote:

> It is not clear to me in what way line 3 is different than line 2 - both
> are assignments... Please clarify
>
> Elisha
>
> On Thu, Jun 18, 2009 at 10:37 AM, Jojo Mwebaze <jojo.mwebaze at gmail.com>wrote:
>
>> Hi Tutor
>>
>> The problem i have is to see which statements modify my data at execution
>> time without referring to the code. Referring to the code is difficult esp
>> because of branching. You can never tell before hand which branch execution
>> will follow.
>>
>> e.g in the example below, statements 1, 2, 5,7 and 10 modify my data and
>> are the ones i would like to trace during run time. However the other
>> statements do not change my data so am not interested in them.
>>
>> How can this be achieved during execution? Not sure if the traceback
>> module can be helpful here!
>>
>> Cheers
>>
>> Jojo.
>>
>> ===========================
>>
>> def myfunction():
>> 1.    num1= 20 #statement 1
>> 2.    num2 = 30 #statement 2
>> 3.    somelist= [ ]  #statement 3
>> 4.    if (num1 < num2):
>> 5.          num2 = num2 * 20 #statement 3
>> 6.    else:
>> 7         num2 = num1 + num2 #statement 3
>> 8.    mylist = [num1, num2] #statement 4
>> 9.    for items in mylist:
>> 10.       somelist.append( math.sqrt(item) + math.log(item)) #statement 5
>> 11.   return somelist
>>
>>
>> _______________________________________________
>> Tutor maillist  -  Tutor at python.org
>> http://mail.python.org/mailman/listinfo/tutor
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/tutor/attachments/20090618/206af636/attachment.htm>