在Flask中显示Exception的最佳方法是什么？

Question

I'm a newbie in Flask and I am trying to display the Built-In Exceptions in python but I can't seem to have them display on my end.

NOTE:

set FLASK_DEBUG = 0

CODE:

def do_something:
    try:
        doing_something()
    except Exception as err:
        return f"{err}"

Expectation:

• It will display one of the built-in exceptions:
  • KeyError
  • IndexError
  • NameError
  • Etc.

Reality:

• It will return the line of code that didn't worked which is more ambiguous to the end user.

Also:

• I have no problem seeing the errors when the debug mode is ON but that's not something that I want to do if I open them in public

Answer 1

Try with this:

def do_something:
    try:
        doing_something()
    except Exception as err:
        return f"{err.__class__.__name__}: {err}"

Answer 2

Flask supplies you with a function that enables you to register an error handler throughout your entire app ; you can do something as shown below:

def handle_exceptions(e):
    # Log exception in your logs
    # get traceback and sys exception info and log as required   
    # app.logger.error(getattr(e, 'description', str(e)))

    # Print traceback

    # return your response using getattr(e, 'code', 500) etc. 

# Exception is used to catch all exceptions
app.register_error_handler(Exception, handle_exceptions)

In my honest opinion, this is the way to go. - Following the structure found in werkzeug.exceptions.HTTPException as an example is a solid foundation.

Having a unified exception handler that will standardise your Exception handling, visualisation and logging will make your life a tad better. :)