Let wing running a script when user close/exit it.

edit

Thanks a lot, based on your above instructions. I write the following script in ~/.wingpro7/scripts named as preferences-strip.py and it does the trick:

import wingapi

def _quitting():
  # Do something here
  import os
  import re

  # https://ask.wingware.com/question/2091/the-meaning-for-the-perference-option-mainlast-prefs-page/
  # https://ask.wingware.com/question/2085/duplicates-entries-generated-for-mainupdate-history-list-in-the-wingpro7preferences/
  flag = False
  preferences = os.environ['HOME'] + '/.wingpro7/preferences'
  lines = []
  with open(preferences, 'r') as f:
      for line in f:
          line = line.strip('\n')
          if re.match(r'^main[.](update-history|last-prefs-page)', line):
              flag = True
          else:
              if flag and not re.match(r'[ ]', line):
                  flag = False
          if not flag:
              lines.append(line)

  with open(preferences, "w") as f:
      f.write('\n'.join(str(item) for item in lines))
      f.write('\n')

  pass

wingapi.gApplication.fSingletons.fGuiMgr.connect('about-to-quit', _quitting)

But I still cannot figure out why you use pass command on the example codes. Any hints?

Regards.

"pass" does nothing. It's used in Python as a place-holder so you can write something that's syntactically correct but doesn't have actual code in it yet. You can remove it from your code above...