[Zope] try clause in external method

[Garry Saddington]

I have the following external method which takes an input .csv file and enters 
the data into a database by calling a ZSQL method. There may be errors in the 
input file and so I am trying to catch them and insert each bad row in a 
different table. The errors are detected by table constraints on the table 
definition and should be reported by the Psycopg connector. However no 
correct rows are entered and only the last error row is entered. Can anyone 
see what I am doing wrong in this script?

def timetabler(self,REQUEST):
  import csv,string
  f=REQUEST.form["TTEXPORT.CSV"]
  from cStringIO import StringIO
  filebody=StringIO(f.read())
  r = 
csv.DictReader(filebody("day","periodstart","periodend" ,"year","teachgroup","teacher" ,"subject" ,"set" ,"room"))
  for row in r:
	  try:
              self.insertintoiclasses(**row)
	  except:
	      self.insertimporterrors(**row)
  dtmlMethodName="manage_import_from_timetabler"
  return self[dtmlMethodName](self,self.REQUEST)

regards
garry