dict两种遍历方法

采用for...in...遍历：

>>> for i in dd:
...     print("%s:%s"%(i,dd[i]))
...
1:chen
2:hang
3:wust
4:wang
5:yadan
6:wuhan
8:xinzhou
9:haha

采用dd.items()遍历：

>>> for k,v in dd.items():
...     print("%s:%s"%(k,v))
...
1:chen
2:hang
3:wust
4:wang
5:yadan
6:wuhan
8:xinzhou
9:haha

dd为：

>>> dd
{1: 'chen', 2: 'hang', 3: 'wust', 4: 'wang', 5: 'yadan', 6: 'wuhan', 8: 'xinzhou', 9: 'haha'}

dd