[Tutor] Program Slicing / Trace
jojo.mwebaze at gmail.com
Thu Jun 18 17:33:23 CEST 2009
True both are assignments, L3, does change a value of any variable.
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
> 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!
>> 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
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