Making code faster

[JB]

How can I make the following code faster? I open a (text) 
file and read the lines in the file. The lines of the file 
have the form

[<string>,<string>]

After the lines have been loaded, I set up a new list via 
the function tmp1.

    i = -1
    print 'loading file'
    def tmp1(s):
      global i
      i += 1
      return QSimpleViewItem(i,self.sv.lv.newColor,eval(s))

    try:
      myfile = open(filename)
    except:
      pass
    else:
      tmp = myfile.readlines()
      print 'lines loaded'
      datei.close()
      self.sv.lv.rows = map(tmp1,tmp)
      self.sv.lv.visible = range(len(self.sv.lv.rows))
      print 'lines decoded',self.sv.lv.rows[0].col[0]

Any ideas? It is astonishing that loading the lines from 
external storage takes much less time than the mapping 
itself!

-- 
Janos Blazi


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