python:watch_file,copy,rename

f29825604

How do I watch a file for changes?回答17:Python copy files to a new directory and rename if file name already exists
回答:I always use the time-stamp - so its not possible, that the file exists already:


合併兩個檔案

1. #!python3
   
2. import os
   
3. import sys
   
4. import time
   
5. import shutil
   
6. import datetime
   
7. 
   
8. # 看'my_file.txt'發生變化時,
   
9. # 複製檔案copy(src_dir,dst_dir),
   
10. # 加上str(now)變化當下的時間重新命名
    
11. 
    
12. class Watcher(object):
    
13.     running = True
    
14.     refresh_delay_secs = 1
    
15. 
    
16.     # Constructor
    
17.     def __init__(self, watch_file, call_func_on_change=None, *args, **kwargs):
    
18.         self._cached_stamp = 0
    
19.         self.filename = watch_file
    
20.         self.call_func_on_change = call_func_on_change
    
21.         self.args = args
    
22.         self.kwargs = kwargs
    
23. 
    
24.     # Look for changes
    
25.     def look(self):
    
26.         stamp = os.stat(self.filename).st_mtime
    
27.         if stamp != self._cached_stamp:
    
28.             self._cached_stamp = stamp
    
29.             # File has changed, so do something...
    
30.             now = str(datetime.datetime.now())[:19]
    
31.             now = now.replace(":","_")
    
32. 
    
33.             src_dir="C:\\Users\\Asus\\Desktop\\Versand Verwaltung\\Versand.xlsx"
    
34.             dst_dir="C:\\Users\\Asus\\Desktop\\Versand Verwaltung\\Versand_"+str(now)+".xlsx"
    
35.             shutil.copy(src_dir,dst_dir)
    
36.             print('File changed'+str(now))
    
37.             if self.call_func_on_change is not None:
    
38.                 self.call_func_on_change(*self.args, **self.kwargs)
    
39. 
    
40.     # Keep watching in a loop        
    
41.     def watch(self):
    
42.         while self.running:
    
43.             try:
    
44.                 # Look for changes
    
45.                 time.sleep(self.refresh_delay_secs)
    
46.                 self.look()
    
47.             except KeyboardInterrupt:
    
48.                 print('\nDone')
    
49.                 break
    
50.             except FileNotFoundError:
    
51.                 # Action on file not found
    
52.                 pass
    
53.             except:
    
54.                 print('Unhandled error: %s' % sys.exc_info()[0])
    
55. 
    
56. # Call this function each time a change happens
    
57. def custom_action(text):
    
58.     print(text)
    
59. 
    
60. watch_file = 'my_file.txt'
    
61. 
    
62. # watcher = Watcher(watch_file)  # simple
    
63. watcher = Watcher(watch_file, custom_action, text='yes, changed')  # also call custom action function
    
64. watcher.watch()  # start the watch going

複製代碼

1. 
   

複製代碼

f29825604

1. #監看d:\temp下檔案的變化事件#移動,新增,刪除,修正#

複製代碼

1. from watchdog.observers import Observer
   
2. from watchdog.events import *
   
3. import time
   
4. 
   
5. class FileEventHandler(FileSystemEventHandler):
   
6.     def __init__(self):
   
7.         FileSystemEventHandler.__init__(self)
   
8. 
   
9.     def on_moved(self, event):
   
10.         if event.is_directory:
    
11.             print("directory moved from {0} to {1}".format(event.src_path,event.dest_path))
    
12.         else:
    
13.             print("file moved from {0} to {1}".format(event.src_path,event.dest_path))
    
14. 
    
15.     def on_created(self, event):
    
16.         if event.is_directory:
    
17.             print("directory created:{0}".format(event.src_path))
    
18.         else:
    
19.             print("file created:{0}".format(event.src_path))
    
20. 
    
21.     def on_deleted(self, event):
    
22.         if event.is_directory:
    
23.             print("directory deleted:{0}".format(event.src_path))
    
24.         else:
    
25.             print("file deleted:{0}".format(event.src_path))
    
26. 
    
27.     def on_modified(self, event):
    
28.         if event.is_directory:
    
29.             print("directory modified:{0}".format(event.src_path))
    
30.         else:
    
31.             print("file modified:{0}".format(event.src_path))
    
32. 
    
33. if __name__ == "__main__":
    
34.     observer = Observer()
    
35.     event_handler = FileEventHandler()
    
36.     observer.schedule(event_handler,"d:/temp",True)
    
37.     observer.start()
    
38.     try:
    
39.         while True:
    
40.             time.sleep(1)
    
41.     except KeyboardInterrupt:
    
42.         observer.stop()
    
43.     observer.join()

複製代碼

f29825604

sdsaeleader with Pandas/Numpy
在eleader程式交易中，除了提供類似easy_language的語法之外，其實內容是可用Python的語法。


Python File Write
Example

Open the file "demofile3.txt" and overwrite the content:

感謝 生魚片

交易訊號應該也可以試試看