1 循环
1.1 For in循环
[root@daidai python]# cat for.py
#!/usr/bin/python
# -*- coding:utf-8 -*-
list=[1,2,3,4,5]
for i in list:
print(i)
list=(1,2,3,4,[3,4],(3,4))
for i in list:
print(i)
[root@daidai python]# python !$
python for.py
1
2
3
4
5
1
2
3
4
[3, 4]
(3, 4)
[root@daidai python]# cat sum100.py
#!/usr/bin/python
# -*- coding:utf-8 -*-
sum=0
l=list(range(101)) list(range(101))生成0-100的有序整数
for i in l:
sum=sum+i
print(sum)
l=tuple(range(101))
for i in l:
sum=sum+i
print(sum)
[root@daidai python]# python sum100.py
5050
10100
1.2 while循环
只要条件满足，就不断循环，条件不满足时退出循环。
[root@daidai python]# cat listpop.py
#!/usr/bin/python
# -*- coding:utf-8 -*-
l=[1,2,3,4]
num=0
while l:
l.pop()
num=num+1
print(num)
删除l中的元素，直到删尽
[root@daidai python]# python listpop.py
4 --4为l中的元素个数
