IDLE 3.0 >>> dic = {"aa":1,"bb":2,"ab":3} >>> dic {'aa': 1, 'ab': 3, 'bb': 2} >>> for k in sorted(dic.keys()): print (k) aa ab ----------------------------------------------- 字典对象其实就是键-值对 下面是字典对象的添加，修改，删除 (修改与添加方法相同，当key值不存在的时候添加) >>> dic["cc"] = 4 >>> dic {'aa': 1, 'cc': 4, 'ab': 3, 'bb': 2} >>> dic["bc"] = 5 >>> dic {'aa': 1, 'cc': 4, 'ab': 3, 'bb': 2, 'bc': 5} >>> dic["cc"] = 6 >>> dic {'aa': 1, 'cc': 6, 'ab': 3, 'bb': 2, 'bc': 5} >>> del dic["cc"] >>> dic {'aa': 1, 'ab': 3, 'bb': 2, 'bc': 5}