如何在两个日志之间添加新行或分隔符

以下代码用于记录

app = flask.Flask(__name__)

if app.debug is not True:
    import logging
    from logging.handlers import RotatingFileHandler
    file_handler = RotatingFileHandler('error.log', maxBytes=1024 * 1024 * 100, backupCount=20)
    file_handler.setLevel(logging.ERROR)
    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
    file_handler.setFormatter(formatter)

    app.logger.addHandler(file_handler)

创建新日志后，如何添加分隔符（新行或连字符组）？

经过评论中的建议：

    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s \n")

我得到：

2020-03-11 15:36:31,289 - testapp - ERROR - Exception on /test/3456789876543333334567-letter-words [GET]   
\*newline added here\*
Traceback (most recent call last):
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)
2020-03-11 15:36:31,289 - testapp - ERROR - Exception on /test/3456789876543333334567-letter-words [GET]   
\*newline added here\*
Traceback (most recent call last):
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)

但是我想要这样的东西：

2020-03-11 15:36:31,289 - testapp - ERROR - Exception on /test/3456789876543333334567-letter-words [GET]    
Traceback (most recent call last):
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)
\*newline to be added here\*
2020-03-11 15:36:31,289 - testapp - ERROR - Exception on /test/3456789876543333334567-letter-words [GET]   
Traceback (most recent call last):
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 2446, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\DELL\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1951, in full_dispatch_request
    rv = self.handle_user_exception(e)

问题来源：stackoverflow