如果发生断开连接，希望引发异常，然后在另一个文件中重新启动main方法。 我应该如何实施呢？

Question

If disconnect is called, I want to restart the main method from the connection.py file. Main method does not restart with existing code when disconnect occurs.

connection.py file*

def disconnect(flags):
    #do something
    raise RuntimeError('You have been disconnected')

main.py file*

import connection

def main():

while True:
     try: 
         #do something to invoke disconnect
     except RuntimeError('You have been disconnected'):
         main()

 main()

Answer 1

Your try-except block is wrong. I ran your code in python3, and it raised a very clear error, "builtins.TypeError: catching classes that do not inherit from BaseException is not allowed" Because of that unhandled exception, you exit main.

Try these:

try: 
    raise RuntimeError('You have been disconnected')
except RuntimeError:
    print ('caught')

try: 
    raise RuntimeError('You have been disconnected')
except RuntimeError as e:
    print (str(e))

Because you already have a while loop in main, there's no need to recursively call main again. Just let the while loop do its job:

def main():
    while True:            
        connect()                            
        try: 
            raise RuntimeError('You have been disconnected')
        except RuntimeError as e:
            print (str(e))

If the error is caught, then you will still be inside the while loop.