Question

I’m working with django, and I’m iterating over a list of different keys,
Now per key i want to write some things to a file, so I get the objects by key. like:

for ids in Idlist:

    try:
        Loci = Locus.objects.get(Gen_ID=ids)

    except:
        #no locus info found
        pass
    try:    
        Itag = Itag_annotatie.objects.get(Gen_ID=ids)
    except:
        #no Itag info found
        pass
    try:
        Ncbi = NCBI.objects.get(Gen_ID=ids)
    except:
        #No NCBI info found
        pass

    writer.writerow([Itag.Gen_ID, Itag.Solyc, Ncbi.defname, Loci.Lociname])

(example code)
How do I empty the object after each writerow?
every key is different.
(didn’t create database with django, Implemented my own database)

So I want to empy the object Instance in Python, but NOT delete the information from the database

Henkes

edit: I want to empty the Ncbi, Loci and Itag objects.

Answer 1

You can set them to None at the beginning of for loop:

for ids in Idlist:
    Loci = None
    Itag = None
    Ncbi = None  

    try:
        Loci = Locus.objects.get(Gen_ID=ids)

    except:
        #no locus info found
        pass
    ....
    #your for loop 
    ....
    # use attributes if objects found, else use ''
    writer.writerow([Itag.Gen_ID if Itag else '',
                   Itag.Solyc if Itag else '', 
                   Ncbi.defname if Ncbi else '', 
                   Loci.Lociname if Loci else ''])