Help cleaning up some code

odeits odeits at
Sun Mar 8 07:58:22 CET 2009

On Mar 7, 1:07 pm, Scott David Daniels <Scott.Dani... at Acm.Org> wrote:
> odeits wrote:
> > I am looking to clean up this code... any help is much appreciated.
> > Note: It works just fine, I just think it could be done cleaner.
> > The result is a stack of dictionaries. the query returns up to
> > STACK_SIZE ads for a user. The check which i think is very ugly is
> > putting another contraint saying that all of the ni have to be the
> > same.
> Well, the obvious way to get your constraint is by changing your SQL,
> but if you are going to do it by fetching rows, try:
>      FIELDS = 'ni adid rundateid rundate city state status'.split()
>      ni = UNSET = object() # use None unless None might be the value
>      stack = []
>      rows = self.con.execute(adquerystring, (user,STACK_SIZE)).fetchall()
>      for row in rows:
>          ad = dict()
>          for field in FIELDS:
>              ad[field] = row[field]
>          for field in 'city', 'state':
>              if ad[field] is None:
>                  ad[field] = 'None'
>          if ni != ad['ni']:
>              if ni is UNSET:
>                  ni = ad['ni']
>              else:
>                  break
>          stack.append(ad)
> --Scott David Daniels
> Scott.Dani... at Acm.Org

Taking from several suggestions this is what i have come up with for

         for row in  ifilter(lambda r: r['ni'] == rows[0]['ni'],rows):
            ad = dict()

            keys = row.keys() # if python 2.6
            keys =
['ni','adid','rundateid','rundate','city','state','status'] # if
python 2.5

            for index in row.keys():
                if row[index] is None:
                    ad[index] = 'None'
                    ad[index] = row[index]
            print row

the test to see if the ad is valid is placed in the ifilter so that I
dont build the dictionary unnecessarily. and the None special case is
fairly simple to read now. The None case would even be irrelevant if i
could get the damn xmlrpc to allow null. sigh. anyhow. thanks for all
of your input, it is definitely better than it was ;)

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