python - page_not_found(e)中e代表的是什么？

Question

《Flask web development》 3.3自定义错误页面

@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'), 404
    

使用errorhandler装饰器，其中page_not_found(e)是继承与e的子类么？这个e代表的是什么意思？

Answer 1

From the definition, e is the parameter of page_not_found, and e may be an instance of Exception, which can be identified by
type(e).

Answer 2

You will know if you try without writing e. The foundation is not solid. . .

Answer 3

I saw this place too. See it from this Chinese document

An error handler is a function similar to a view function, but it is executed when an error occurs, and the error is passed in as a parameter. Generally the error will be an HTTPException , but in some cases it will be other errors: the internal server's error handler will be executed with the actual code error being caught as a parameter.

This little e can be an error caused by HTTP or other errors (thank you for the reminder).

Answer 4

e is an error object. The error information is stored in this variable, similar to:

try:
    eat()
except Exception as e:
    print(e)