Python-сообщество

import os, time
path_to_watch = "c:\\temp\\"
before = dict ([(f, 0) for f in os.listdir (path_to_watch)])
print (before)
before.pop('test1')
print (before)

{'test1.zip': 0, 'test1': 0, 'The Crossroads Of Time.jpg': 0, 'atmelstudio.txt': 0}
{'test1.zip': 0, 'The Crossroads Of Time.jpg': 0, 'atmelstudio.txt': 0}

 
removed = [f for f in before if not f in after]
  if added: before.update(added)  #добавить  новую пару в словарь (не работает)
  if removed: before.pop(removed)  # удалить   пару из словаря (не работает)

import os, time
path_to_watch = "c:\\temp\\"
before = dict ([(f, 0) for f in os.listdir (path_to_watch)])
while 1:
  time.sleep (3)
  after = dict ([(f, 0) for f in os.listdir (path_to_watch)])
  added = [f for f in after if not f in before]
  removed = [f for f in before if not f in after]
  
  if added:
    for x in added:
      before.setdefault(x,0)
  if removed:
    for x in removed:
      before.pop(x)
  for x in before:
      before[x] += 1
      if before[x] == 100:
         print ('Alarm!!!!')
  print (before)

  if added:
    for x in added:
      before.setdefault(x,0)

before[x] = 0