Python 根据两个字段排序中文排序汉字排序升序降序 _生活百科

Python3写法代码# -*- coding: utf-8 -*-# 需求：年龄倒序，姓名正序from itertools import chainfrom pypinyin import pinyin, Styleclass Student:def __init__(self, name, age):self.name = nameself.age = agedef to_pinyin(stu):lst = pinyin(stu.name, style=Style.TONE3)# 例：[['zhang1'], ['san1']]print(lst)iterator = chain.from_iterable(lst)# 迭代器iterator_for_print = chain.from_iterable(lst)# 迭代器print(iterator_for_print)for item in iterator_for_print:print(item)# 写法一return ''.join(iterator)# 写法二# return ''.join(chain.from_iterable(pinyin(stu.name, style=Style.TONE3)))studentList = [Student("张三", 25),Student("小红", 22),Student("王五", 25),Student("小张", 22),Student("李四", 25),Student("小明", 22)]# 写法一# studentList.sort(key=lambda stu: pinyin(stu.name, style=Style.TONE3))# 写法二studentList.sort(key=lambda stu: to_pinyin(stu))studentList.sort(key=lambda stu: stu.age, reverse=True)print("排序结果：")for student in studentList:print(str(student.age) + " " + student.name)输出结果【Python 根据两个字段排序中文排序汉字排序升序降序】

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Python2写法代码

# -*- coding: utf-8 -*-# 需求：年龄倒序，姓名正序from itertools import chainfrom pypinyin import pinyin, Styleclass Student:def __init__(self, name, age):self.name = nameself.age = agedef to_pinyin(stu):lst = pinyin(stu.name.decode("utf-8"), style=Style.TONE3)# 例：[['zhang1'], ['san1']]print(lst)iterator = chain.from_iterable(lst)# 迭代器iterator_for_print = chain.from_iterable(lst)# 迭代器print(iterator_for_print)for item in iterator_for_print:print(item)# 写法一return ''.join(iterator)# 写法二# return ''.join(chain.from_iterable(pinyin(stu.name.decode("utf-8"), style=Style.TONE3)))studentList = [Student("张三", 25),Student("小红", 22),Student("王五", 25),Student("小张", 22),Student("李四", 25),Student("小明", 22)]# 写法一# studentList.sort(key=lambda stu: pinyin(stu.name.decode("utf-8"), style=Style.TONE3))# 写法二studentList.sort(key=lambda stu: to_pinyin(stu))studentList.sort(key=lambda stu: stu.age, reverse=True)print("排序结果：")for student in studentList:print(str(student.age) + " " + student.name)

输出结果

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C#的示例代码

List<Student> list = new List<Student>(){new Student("张三", 25),new Student("小红", 22),new Student("王五", 25),new Student("小张", 22),new Student("李四", 25),new Student("小明", 22)};//方法一，虽然写法繁琐 ， 但思路清晰list.Sort((a, b) =>{if (a.Age != b.Age){return b.Age - a.Age;}else{return string.Compare(a.Name, b.Name);}});//方法二 ， 简捷清晰明了//list = list.OrderByDescending(a => a.Age).ThenBy(a => a.Name).ToList();foreach (var item in list){Console.WriteLine(item.Age + " " + item.Name);}Console.Read();class Student{public string Name { get; set; }public int Age { get; set; }public Student(string name, int age){Name = name;Age = age;}}

输出结果

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对比C#，Python的坑

Python默认的中文排序得不到预期的结果，需要引用pypinyin库解决，相当麻烦，要看懂这个代码，需要了解迭代器
Python2的pypinyin库只支持unicode编码的字符串，必须通过decode转码，如果不转码，则抛出错误：must be unicode string or [unicode, ...] list
Python没有大括号，无法直接在lambda表达式中写方法，方法必须定义在lambda表达式外部
Python的lambda写法相对难以理解

经验丰富的程序员会说，这还不简单？但是对于新手来说，非常不人性化，非常浪费时间。我作为一个Python新手，就写个简单的排序程序，花了很长时间才学会怎么写，当然，确实没有去看文档，只通过百度和在技术群里问，但是没有一个一口答出正确答案，最后自己摸索成功。有人说Python2忘的差不多了，C#就不会忘。用到pypinyin库时，还不习惯看pypinyin库的源码，pinyin方法的注释非常详细，不过没有C#这种强类型的语言看起来方便。