使用Python觀察文件更改的目錄不起作用

Question

我使用此http://brunorocha.org/python/watching-a-directory-for-file-changes-with-python.html示例來解決此任務。它的工作。 當我還沒有使用OOP。現在，我試圖重寫我的代碼，面向對象，我做了什麼： 我創建的文件名稱爲MyHandler.py

#!/usr/bin/python3 
# -*- coding: utf-8 -*- 

import sys 

from watchdog.events import PatternMatchingEventHandler 

class MyHandler(PatternMatchingEventHandler): 
    patterns = ["*.xml", "*.lxml"] 

    def __init__(self, logger, myfunction): 
     self.logger = logger 
     self.myfunction = myfunction 

    def process(self, event): 
     """ 
     event.event_type 
      'modified' | 'created' | 'moved' | 'deleted' 
     event.is_directory 
      True | False 
     event.src_path 
      path/to/observed/file 
     """ 
     self.logger.debug("target: {} was {}".format(event.src_path, event.event_type)) 
     self.myfunction() 

    def on_created(self, event): 
     self.process(event) 

接下來，我打電話這在我的其他文件，在那裏我有功能的閱讀XML：

observer = Observer() 
observer.schedule(MyHandler(self.logger, self.read_xml), path=self.mydir) 
observer.start() 

try: 
    while True: 
     time.sleep(1) 
except KeyboardInterrupt: 
    observer.stop() 

observer.join() 

而且，當我試圖把這個我有：

AttributeError: 'MyHandler' object has no attribute '_ignore_directories' 

在那裏我有錯誤？在我用OOP進行實驗之前，我有：

class MyHandler(PatternMatchingEventHandler): 
    patterns = ["*.xml*", "*.lxml"] 

    def process(self, event): 
     """ 
     event.event_type 
      'modified' | 'created' | 'moved' | 'deleted' 
     event.is_directory 
      True | False 
     event.src_path 
      path/to/observed/file 
     """ 
     logger.debug("Target: {} was {}".format(event.src_path, event.event_type)) 
     read_xml() 

    def on_created(self, event): 
     self.process(event) 

    if __name__ == "__main__" 

     observer = Observer() 
     observer.schedule(MyHandler(), path=mydir) 
     observer.start() 

     try: 
      while True: 
       time.sleep(1) 
     except KeyboardInterrupt: 
      observer.stop() 

     observer.join() 

而且它工作。現在，我的腳本不起作用。請幫忙。

Answer 1

你是不是調用父（PatternMatchingEventHandler）對象的構造

def __init__(self, logger, myfunction): 
    super().__init__() # <--- Put arguments to PatternMatchingEventHandler if constructor here if needed 
    self.logger = logger 
    self.myfunction = myfunction 

構造函數需要被調用來設置一些父類要求，如_ignore_directories實例變量。