案例1：找到字典value的最大值

对于一个dict，找到其value的最大值
常规的做法：

def fun(person):
    max = 0
    name = ""
    for key,value in person.items():
        if value > max:
            max = value
            name = key
    print(name)
    print(max)
person = {"li": 18, "wang": 50, "zhang": 20, "sun": 22}
fun(person)

nice的做法：

使用max和排序手段：
person = {"li": 18, "wang": 50, "zhang": 20, "sun": 22}
print(max(person.values()))
result = max(person.items(),key=operator.itemgetter(1))
print(result) # ('wang', 50)

案例2：对字典排序

x = [
	{"语文":80,"数学":90,"英语":70,"物理":92,"化学":83},
	{"语文":82,"数学":70,"英语":78,"物理":90,"化学":80},
	{"语文":86,"数学":89,"英语":73,"物理":82,"化学":88},
	{"语文":76,"数学":86,"英语":60,"物理":82,"化学":79}
	]
#使用itemgetter,按照语文成绩排序
x_yuwen = sorted(x, key = itemgeter("语文"))
#使用itemgetter,按照数学成绩排序
x_shuxue = sorted(x, key = itemgetter("数学"))
#使用匿名函数按照物理成绩排序
 x_wuli = sorted(x, key = lambda x:x["物理"])

其实说白了，以上主要是对itemgetter的认识。