1 if
i=10
j=5
if j>10:
print 'i>j'
elif j<10:
print 'i<j'
else:
print 'i=j'
2 while循环
i=10
while True:
j=int(raw_input('enter an integer:'))
if j>10:
print 'i>j'
elif j<10:
print 'i<j'
else:
print 'i=j'
3 for 循环
for i in range(1,6):
print i
else:
print 'end'
4 break 中断
while True:
i=raw_input('enter something:')
if i == 'exit':
break
print i
5continue就是跳出剩下循环,继续下轮循环
while True:
i=raw_input('enter something:')
if i == 'exit':
break
print i
if len(i)<3:
continue
print 'input len >3'