ubuntu下python基础学习二

一、控制流

1、 if ... elif ...else

#!/usr/bin/python
# filename:demoIf.py
no1=int(raw_input("Enter first number"))
no2=int(raw_input("Enter second number"))
if no1==no2:
        print "="
elif no1         print "<"
else:
        print ">"
print "over!"

2、while ...else

#!/usr/bin/python
#filename;demoWhile.py
loop=True
while loop:
        num=int(raw_input('enter a integer'))
        if num<10:
                print "continue"
                continue
        elif num>100:
                print "break"
                break
        else:
                loop=False
                print "10~100"
else:
        print "while over"

3、for ... else(可选) ...

#!/usr/bin/python
#filename:demofor.py
for i in range(1,10,2):
        print i
else:
        print "loop over"
for i in range(0,10,2):
        print i
        if i==8:
                break
else:
        print "loop over"