1.遍历key
{'a': '1', 'b': '2', 'c': '3'}
>>> for key in a:
print(key+':'+a[key])
a:1
b:2
c:3
>>> for key in a.keys():
print(key+':'+a[key])
a:1
b:2
c:3
在使用上,for key in a和 for key in a.keys():完全等价。
2.遍历value
>>> for value in a.values(): print(value) 1 2 3
3.遍历字典项
>>> for kv in a.items(): print(kv) ('a', '1') ('b', '2') ('c', '3')
4.遍历字典键值
>>> for key,value in a.items():
print(key+':'+value)
a:1
b:2
c:3
>>> for (key,value) in a.items():
print(key+':'+value)
a:1
b:2
c:3