python - Error while adding new code after 3200 lines in Python using IDLE

Question

I have a python program which works fine and has 3200 lines of code. When I try to add new lines of code in it the following error appears:

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python24\lib\lib-tk\Tkinter.py", line 1345, in __call__
    return self.func(*args)
  File "C:\Python24\lib\idlelib\ScriptBinding.py", line 142, in run_module_event
    code = self.checksyntax(filename)
  File "C:\Python24\lib\idlelib\ScriptBinding.py", line 101, in checksyntax
    return compile(source, filename, "exec")
SystemError: com_backpatch: offset too large