Getting started with Python--19--else statements, with statements

1, else with while:

X=input (' Please output an integer: ')

While X>0

X=x-2

Print (x)

Else

Print (' x is already less than or equal to zero! ‘)

2, else with try:

X=input (' Please enter: ')

Try

print (int (x))

Except ValueError as reason:

Print (' Error ' +str (reason))

else: #如果程序报错, the output is the letter of things, that output only error message, else part will not output

Print (' no exception ') #如果没有报错, the output is int (x) and ' no exception ', that is, else also outputs

The following says with

The WITH statement is primarily used with open:

With open (' Xx.txt ') as F:

Print (F.read ())

But when you no longer need this file, or have already read it, it can be closed, it will help you to automatically close, do not need you manually close

Getting started with Python--19--else statements, with statements