I have a bit of code that runs through a dictionary and outputs the values from it in a CSV format. Strangely I'm getting a couple of blank lines where all the output of all of the dictionary entries is blank. I've read the code and can't understand has anything except lines with commas can be output. The blank line should have values in it, so extra \n is not the cause. Can anyone advise why I'd be getting blank lines? Other times I run the missing line appears.

Missing line:

6415, 6469, -4.60, clerical, 2, ,,,joe,030193027org,joelj,030155640dup

Using python 2.6.5

Bit of code:

      tfile = file(path, 'w')
      tfile.write('Rec_ID_A, Rec_ID_B, Weight, Assigned, Run, By, On, Comment\n')
      rec_num_a = 0

      while (rec_num_a <= max_rec_num_a):
        try:
            value = self.dict['DA'+str(rec_num_a)]
        except:
            value = [0,0,0,'rejected']
        if (value[3]!='rejected'):
            weightValue = "%0.2f" % value[2]
            line = value[0][1:] + ', ' + value[1][1:] + ', ' + weightValue \
                             + ', ' + str(value[3]) + ', ' + str(value[4]) 
            if (len(value)>5):
                line = line + ', ' + value[5] + ',' + value[6] + ',' + value[7]
            (a_pkey, b_pkey) = self.derive_pkeys(value)
            line = line + a_pkey + b_pkey
             tfile.write( line + '\n')
        rec_num_a +=1            

Sample output

6388, 2187, 76.50, clerical, 1, ,,,cameron,030187639org,cameron,030187639org
6398, 2103, 70.79, clerical, 1, ,,,caleb,030189225org,caldb,030189225dup
6402, 2205, 1.64, clerical, 2, ,,,jenna,030190334org,cameron,020305169dup
6409, 7892, 79.09, clerical, 1, ,,,liam,030191863org,liam,030191863org

6416, 11519, 79.09, clerical, 1, ,,,thomas,030193156org,thomas,030193156org
6417, 8854, 6.10, clerical, 2, ,,,ruby,030193713org,mia,020160397org
6421, 2864, -0.84, clerical, 2, ,,,kristin,030194394org,connou,020023478dup
6423, 413, 75.63, clerical, 1, ,,,adrian,030194795org,adriah,030194795dup