python 数据类型：字典

>>> dic = {'apple':2, 'orange':1} #定义一个字典>>> dic{'orange': 1, 'apple': 2}>>> newdic = dic.copy()>>> newdic{'orange': 1, 'apple': 2}>>> dic['banana'] = 5 #增加一项>>> dic.items()[('orange', 1), ('apple', 2), ('banana', 5)]>>> dic.pop('apple') #删除'apple'2>>> dic{'orange': 1, 'banana': 5}>>> dic.keys()['orange', 'banana']>>> dic.values()[1, 5]>>> dic.update({'banana':3}) #更新'banana'的值>>> dic{'orange': 1, 'banana': 3}>>> dic.clear()>>> dic{}>>> newdic{'orange': 1, 'apple': 2}