Python
中字典的操作函数主要有以下几种:
函数作用
popD.pop(k[,d]):以字典的键为参数,删除键值对;参数不能省略;如果键不存在,则报错参数有两个,若不存在键就返回第二个
popitem和list.pop类似,不用写参数;字典是无序的,popitem()随机删除一个,并且返回删除的值,返回的格式是元组
update更新字典:将一个字典加到另一个当中;没有返回值
a = {"language": "python", "city": "shenzhen", "number": "1234"}
print(a.pop("number"))
print(a.pop("name", "pengcheng"))
1234
pengcheng
b = {"language": "python", "city": "shenzhen", "number": "1234"}
print(b.popitem())
print(b.popitem())
('number', '1234')
('city', 'shenzhen')
b = {"language": "python", "city": "shenzhen", "number": "1234"}
b1 = {"province": "guangdong"}
b.update(b1)
print(b)
{'language': 'python', 'city': 'shenzhen', 'number': '1234', 'province': 'guangdong'}