[Tutor] Wading through traceback output

[Thomas C. Hicks]

I have a script that I used to be quite proud of, up until today it was
working great.  Basically it reads in a directory tree of spreadsheets,
extracts info from them then makes a new spreadsheet to output the info
to.  The spreadsheets are xls files so it uses xlrd and xlwt to manage
the data extraction and spreadsheet creation.  Today when I ran it
(after a hiatus of about 3 months) I got this output:

Traceback (most recent call last):
  File "./cttOverviewMain.0.03.2011.py", line 294, in <module>
    monthData(searchList)
  File "./cttOverviewMain.0.03.2011.py", line 261, in monthData
    writeMonthlyHeader(writeSheet)
  File "./cttOverviewMain.0.03.2011.py", line 183, in writeMonthlyHeader
    sh.write(7,10,"# Locations",xlwt.easyxf('font: bold True'))
  File "/usr/local/lib/python2.6/dist-packages/xlwt/Worksheet.py", line
1003, in write self.row(r).write(c, label, style)
  File "/usr/local/lib/python2.6/dist-packages/xlwt/Row.py", line 227,
in write style_index = self.__parent_wb.add_style(style)
  File "/usr/local/lib/python2.6/dist-packages/xlwt/Workbook.py", line
303, in add_style return self.__styles.add(style)
  File "/usr/local/lib/python2.6/dist-packages/xlwt/Style.py", line 90,
in add return self._add_style(style)[1]
  File "/usr/local/lib/python2.6/dist-packages/xlwt/Style.py", line
149, in _add_style raise ValueError("More than 4094 XFs (styles)")
ValueError: More than 4094 XFs (styles)

I don't understand this very well at all - any pointers are
appreciated.  I think what it is saying is that there is a problem with
my Python libraries but this is not a problem I have ever seen before.
Is it possible the 2.6 libraries were updated in the hiatus time
causing this problem?  If so any ideas on how I can investigate fixing
this are appreciated.

thomas