1.for循环
#循环遍历 strlist
str = 'a,b,c,d'
strlist = str.split(',')
for i in range(len(strlist)) :
print strlist[i]
#循环求和
sum=0
for v in range(1,101):
sum+=v
print sum
2.while 循环
#循环5次输出i love python
count=5
while count>0:
count=count-1
print"i love python!"
# break 和 continue
count=5
while count>0:
count=count-1
if count == 1:
break #结束循环
if count == 3:
continue # 跳出本次循环
print"i love python!"
3.注： for循环和while循环后面都可以加else子句else子句在整个循环执行条件不符合时执行
例：
--------------------
count=5
while count>0:
print 'i love python'
count=count-1
else:
print 'over'
----------------------
for i in range(0,5):
print i
else:
print 'over'
