Python - Execute a powershell script after a text file is removed from a folder

Prerequisites

• Move a text file to a folder automatically

Steps

0. End result. Output src_path and target_folder name to console.

   

1. Create demo.py and copy / paste following codes.

   import shutil
   import subprocess
   import time
   
   from watchdog.events import PatternMatchingEventHandler
   from watchdog.observers import Observer
   
   
   class FolderHandler(PatternMatchingEventHandler):
   
       def __init__(self, target_folder, *args, **kwargs):
           super().__init__(*args, **kwargs)
           self.target_folder = target_folder
   
       def on_created(self, event):
           # to prevent PermissionError: [Errno 13] Permission denied:
           time.sleep(1)
   
           # move source file to target folder
           shutil.move(event.src_path, self.target_folder)
   
       def on_deleted(self, event):
           # to prevent PermissionError: [Errno 13] Permission denied:
           time.sleep(1)
   
           command = ['PowerShell', '-ExecutionPolicy', 'Unrestricted', f"./powershell.ps1 -src_path '{event.src_path}' -target_folder '{self.target_folder}'"]
   
           subprocess.call(command)
   
   
   if __name__ == '__main__':
       # source_folder: watching folder, target_folder: move file to folder.
       folders = {
           'foo': {
               'source_folder': './foo',
               'target_folder': './home'
           },
           'bar': {
               'source_folder': './bar',
               'target_folder': './home'
           }
       }
   
       observer = Observer()
   
       for _, folder in folders.items():
           # patterns: txt file only
           event_handler = FolderHandler(target_folder=folder['target_folder'], patterns=[
                                       '*.txt'],  ignore_directories=True, case_sensitive=False)
           observer.schedule(
               event_handler,  folder['source_folder'],  recursive=True)
   
       observer.start()
   
       try:
           while True:
               time.sleep(1)
   
       except KeyboardInterrupt:
           observer.stop()
   
       observer.join()
   

2. Create a powershell.ps1 then copy / paste following codes.

   param(
   [string]$src_path,
   [string]$target_folder
   )
   
   Write-Output "src_path: " $src_path "target_folder: " $target_folder
   

3. Run demo.py. Ctrl + F5 or Right click >> "Run Python File in Terminal" within VS Code.

4. Create a text file in foo and bar folders. After the file is removed, output appears.

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