python 笔记5 for循环

1。

s='hello'
l=[1,2,3,'a','b']
t=(7,8,9,'x','y')
for x in l:
    print x
for x in range(len(s)):
    print s[x]


***************************************************************
python 1.py
1
2
3
a
b
h
e
l
l
o

2.

#!/usr/bin/python
s='hello'
l=[1,2,3,'a','b']
t=(7,8,9,'x','y')
for x in l:
    if x>=2:
        print x
for x in range(len(s)):
    print s[x]

python 1.py
2
3
a
b
h
e
l
l
o
3.显现遍历字典

#!/usr/bin/python
s='hello'
l=[1,2,3,'a','b']
t=(7,8,9,'x','y')
d={1:111,2:222,3:333,5:555}
for x in d:
     print x
     print d[x]

或者这样
#!/usr/bin/python
s='hello'
l=[1,2,3,'a','b']
t=(7,8,9,'x','y')
d={1:111,2:222,3:333,5:555}
for k,v in d.items():
     print k
     print v
*******************************
python 1.py
1
111
2
222
3
333
5
555