今天整理的25个常用的Python代码段请果断收藏起来，如果觉得足够好用记得分享给你身边的朋友和同事哟～

1交换两个变量的值

num_1, num_2 = 666, 999# 一行代码搞定交换两个变量的值num_1, num_2 = num_2, num_1print(num_1, num_2)输出：999 666
Process finished with exit code 0

2查找对象使用的内存

import sys
slogan = "今天你学python了么？"size = sys.getsizeof(slogan)print(size)输出：100
Process finished with exit code 0

3反转字符串

slogan = "今天你学习python了么？"# 一行代码搞定字符串的反转new_slogan = slogan[::-1]print(new_slogan)输出：？么了nohtyp习学你天今Process finished with exit code 0

4检查字符串是否为回文

# 定义一个判断字符串是否是回文的函数def is_palindrome(string):    return string == string[::-1]
示例：调用判断函数来进行判断slogan是否是回文字符串slogan = "今天你学python了么？"_ = is_palindrome(slogan)print(_)输出：False
Process finished with exit code 0

5将字符串列表合并为单个字符串

slogan = ["今", "天", "你", "学", "python", "了", "么", "？"]# 一行代码搞定将字符串列表合并为单个字符串real_slogan = "".join(slogan)print(real_slogan)输出：今天你学python了么？
Process finished with exit code 0

6查找存在于两个列表中任一列表存在的元素

# 定义一个函数用来查找存在于两个列表中任一列表存在的元素def union(list1, list2):    return list(set(list1 + list2))
示例：调用该函数用来查找存在于两个列表中任一列表存在的元素list1, list2 = [5, 2, 0], [5, 2, 1]new_list = union(list1, list2)print(new_list)输出：[0, 1, 2, 5]
Process finished with exit code 0

7打印N次字符串

slogan = "今天你学python了么？"new_slogan = 11*sloganprint(new_slogan)输出：今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？今天你学python了么？
Process finished with exit code 0

8链式比较

number = 100print(98<number<102)输出：True
Process finished with exit code 0
print(100==number<102)输出：True
Process finished with exit code 0

9单词大小写

slogan = "python happy"# 一行代码搞定单词大小写转换print(slogan.upper())
# 一行代码搞定单词首字母大写print(slogan.capitalize())
# 一行代码搞定将每个单词的首字母转为大写，其余小写print(slogan.title())输出：PYTHON HAPPYPython happyPython Happy
Process finished with exit code 0

10统计列表中元素的频率

from collections import Counter

numbers = [1, 1, 3, 2, 4, 4, 3, 6]# 一行代码搞定求列表中每个元素出现的频率count = Counter(numbers)print(count)输出：Counter({1: 2, 3: 2, 4: 2, 2: 1, 6: 1})
Process finished with exit code 0

11判断字符串所含元素是否相同

from collections import Counter

course = "python"new_course = "ypthon"count_1, count_2 = Counter(course), Counter(new_course)if count_1 == count_2:    print("两个字符串所含元素相同！")输出：两个字符串所含元素相同！
Process finished with exit code 0

12将数字字符串转化为数字列表

string = "666888"numbers = list(map(int, string))print(numbers)输出：[6, 6, 6, 8, 8, 8]
Process finished with exit code 0

13使用enumerate() 函数来获取索引-数值对

string = "python"for index, value in enumerate(string):    print(index, value)输出：0 p1 y2 t3 h4 o5 n
Process finished with exit code 0

14代码执行消耗时间

import time
start_time = time.time()
numbers = [i for i in range(10000)]
end_time = time.time()time_consume = end_time - start_timeprint("代码执行消耗的时间是：{}".format(time_consume))输出示例：代码执行消耗的时间是：0.002994537353515625
Process finished with exit code 0

15比较集合和字典的查找效率

import time
number = 999999# 生成数字列表和数字集合numbers = [i for i in range(1000000)]digits = {i for i in range(1000000)}
start_time = time.time()# 列表的查找_ = number in numbersend_time = time.time()
print("列表查找时间为：{}".format(end_time - start_time))
start_time = time.time()# 集合的查找_ = number in digitsend_time = time.time()
print("集合查找时间为：{}".format(end_time - start_time))输出：列表查找时间为：0.060904741287231445集合查找时间为：0.0
Process finished with exit code 0

16字典的合并

info_1 = {"apple": 13, "orange": 22}info_2 = {"爆款写作": 48, "跃迁": 49}# 一行代码搞定合并两个字典new_info = {**info_1, **info_2}print(new_info)输出：{'apple': 13, 'orange': 22, '爆款写作': 48, '跃迁': 49}Process finished with exit code 0

17随机采样

import random
books = ["爆款写作", "这个世界，偏爱会写作的人", "写作七堂课", "越书写越明白"]# 随机取出2本书阅读reading_book = random.sample(books, 2)print(reading_book)输出：['这个世界，偏爱会写作的人', '越书写越明白']
Process finished with exit code 0

18判断列表中元素的唯一性

# 定义一个函数判断列表中元素的唯一性def is_unique(list):    if len(list) == len(set(list)):        return True    else:        return False
    # 调用该函数判断一个列表是否是唯一性的numbers = [1, 2, 3, 3, 4, 5]_ = is_unique(numbers)print(_)输出：FalseProcess finished with exit code 0

19计算阶乘 递归函数实现

def fac(n):    if n > 1:        return n*fac(n-1)    else:        return 1
number = int(input("n="))print("result = {}".format(fac(number)) )输出：n=5result = 120
Process finished with exit code 0

20列出当前目录下的所有文件和目录名

import os

files = [file for file in os.listdir(".")]print(files)输出：['.idea', '2048.py', 'access.log', 'beautiful_girls', 'beautiful_girls_photos', 'boy.py', 'cache.json', 'catoffice.py', 'cookie.json', 'data.csv', 'data.txt', 'diary', 'files', 'filtered_words.txt', 'geckodriver.log', 'get_movies_info2.py', 'girl.py', 'girl1.py', 'ha.conf', 'homework.py', 'homework3.py', 'index.html', 'info.ini', 'notepad.py', 'rent.csv', 'stock.txt', 'student.txt', 'student.xlsx', 'student_register_info.json', 'test.png', 'test_picture.txt', 'zhihu.html', '__pycache__', '九尾1997_200行代码实现2048小游戏.py', '九尾1997_python实现图片转字符画.py', '九尾1997_实现一个简单的计算器.py', '九尾1997_爬取优美图美女写真.py', '九尾1997_爬取北京58租房信息.py', '九尾1997_路飞学城注册页面', '校园管理系统.py', '爬虫模拟登录.py', '记事本.m4a']
Process finished with exit code 0

21把原字典的键值对颠倒并生产新的字典

dict_1 = {1: "python", 2: "java"}new_dict = {value:key for key, value in dict_1.items()}print(new_dict)输出：{'python': 1, 'java': 2}
Process finished with exit code 0

22打印九九乘法表

for i in range(1, 10):    for j in range(1, i+1):        print("{} * {} = {}".format(i, j, i*j), end="")    print()输出：1 * 1 = 1 2 * 1 = 2 2 * 2 = 4 3 * 1 = 3 3 * 2 = 6 3 * 3 = 9 4 * 1 = 4 4 * 2 = 8 4 * 3 = 12 4 * 4 = 16 5 * 1 = 5 5 * 2 = 10 5 * 3 = 15 5 * 4 = 20 5 * 5 = 25 6 * 1 = 6 6 * 2 = 12 6 * 3 = 18 6 * 4 = 24 6 * 5 = 30 6 * 6 = 36 7 * 1 = 7 7 * 2 = 14 7 * 3 = 21 7 * 4 = 28 7 * 5 = 35 7 * 6 = 42 7 * 7 = 49 8 * 1 = 8 8 * 2 = 16 8 * 3 = 24 8 * 4 = 32 8 * 5 = 40 8 * 6 = 48 8 * 7 = 56 8 * 8 = 64 9 * 1 = 9 9 * 2 = 18 9 * 3 = 27 9 * 4 = 36 9 * 5 = 45 9 * 6 = 54 9 * 7 = 63 9 * 8 = 72 9 * 9 = 81 
Process finished with exit code 0

23计算每个月天数

import calendar
month_days = calendar.monthrange(2025,8)print(month_days)输出：(4, 31)
Process finished with exit code 0

24随机生成验证码，调用随机模块

import random, string
str_1 = "0123456789"# str_2 是包含所有字母的字符串str_2 = string.ascii_lettersstr_3 = str_1 + str_2# 多个字符中选取特定数量的字符verify_code = random.sample(str_3, 6)# 使用join方法拼接转换为字符串verify_code = "".join(verify_code)print(verify_code)输出：Mk0L6Y
Process finished with exit code 0

25判断闰年

year  = input("请输入一个年份：")year = int(year)# 一行代码判断年份是否是闰年if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:    print("{}是闰年！".format(year))else:    print("{}不是闰年！".format(year))输出示例：请输入一个年份：20002000是闰年！
Process finished with exit code 0

996 一直是互联网老生常谈的话题了，但抛开其他只谈工作本身，你有没有想过，下班晚、加班，有时候可能是因为自己工作比较低效？

所以，平时多积累好用、常用、简洁的代码段真的非常有必要。

再次强调一下，如果觉得这些代码段有帮助，请一定要收藏起来，另外也不要忘了分享给你身边的朋友和同事哟～