Use of Python exceptions

Pseudo code:

Try

The code of the error section ...

Except Exception as E:

print ' 404 Web page ' #Exception是所有错误类型的父类, including all error messages

Finally

Action (whether or not an error occurs, finally is executed)

defFoo (s):return10/Int (s)defBar (s):returnFoo (s) * 2defMain ():Try: Bar ('0')    exceptException as E:Print('Error:', E)finally:        Print('finally ...')

Custom Thrown exception: (less used) http://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/ 00143191375461417a222c54b7e4d65b258f491c093a515000

# err_raise.py class Fooerror (valueerror):     Pass def Foo (s):     = Int (s)    if n==0:        raise fooerror ('Invalid Value:%s' % s)    return / nfoo ('0 ')

Use of Python exceptions