1、遍历key值,value值(下面写法完全等价): a = {'a': '1', 'b': '2', 'c': '3'} 方式一: for key in a: print(key+':'+a[key]) 方式二: for key in a.keys(): print(key+':'+a[key]) 方式三: for key,value in a.items(): print(key+':'+value) 方式四: for (key,value) in a.items(): print(key+':'+value) 打印结果: a:1 b:2 c:3 2、遍历value值: for value in a.values(): print(value) 打印结果: 1 2 3 3、遍历字典项 for kv in a.items(): print(kv) 打印结果: ('a', '1') ('b', '2') ('c', '3')