Python, exception

Python, exception

Like Java, Pyton exception objects indicate exceptions. When an error occurs, an exception is thrown. If the exception object is not processed or captured, the program uses the so-called trace ack to terminate the execution;

>>> 1/0

Traceback (most recent call last ):

File" ", Line 1, in

ZeroDivisionError: Division by zero

The program can manually throw an exception through raise javastin.

>>>Raise Exception

Traceback (most recent call last ):

File" ", Line 1, in

Exception

>>>Raise Exception ("hello exception ")

Traceback (most recent call last ):

File" ", Line 1, in

Exception: hello exception

To customize the Exception type, you only need to inherit the Exception (or its subclass;

>>>Raise 1

Traceback (most recent call last ):

File" ", Line 1, in

TypeError:Exceptions must derive from BaseException

Unlike C ++, only exception classes can be thrown;

>>> Class MyException (Exception):

... Pass

...

>>>Raise MyException

Traceback (most recent call last ):

File" ", Line 1, in

_ Main _. MyException

Capture exceptions

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...

Finally

Traceback (most recent call last ):

File" ", Line 2, in

ZeroDivisionError: division by zero

>>> Def f ():

... Try:

.... Return 1/0

... Finally:

... Return 2

...

>>> F ()

2