零基础python教程：字典

python中的字典和c++中的map相似。是一种key和value形式存储结构的容器。

工具/原料

python

pycharm

字典的初始化

1、a = {1:'PYTHON'}b = {'key':'PYTHON'}c = {"key":1}上面这上三种写法都是合法的。

字典的遍历

1、c = {"key":1,"key2":1,"key3":2}for k in c: print k, c[k];

2、c = {"key":1,"key2":1,"key3":2}for item in c.items(): print item;

3、c = {"key":1,"key2":1,"key3":2}for k, v in a.items(): print k,v;

字典元素新增和删除

1、新增一个元素c = {"氯短赤亻key":1,"key2":1,"key3":2}c["add"] = 100;for k, v in c.items(): print k,v;

2、删除元素c = {"key":1,"key2":1,"key3":2}del c["key"]for k, v in c.items(): print k,v;

字典内容的修改

1、c = 辘腋粪梯{"key":1,"key2":1,"key3":2}c["key"] = "I modify it!"for k, v in c.items(): print k,v;