推荐收藏，25条实用简洁的 Python 代码真香啊

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？

大家好，今天周末，整理的25个常用的Python代码段，平时多积累好用、常用、简洁的代码段真的非常有必要。喜欢记得收藏、点赞、关注。

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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_1
print(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*slogan
print(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 = 100
print(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 HAPPY
Python happy
Python 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 p
1 y
2 t
3 h
4 o
5 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_time
print("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 numbers
end_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 digits
end_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：
False
Process 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=5
result = 120

Process finished with exit code 0

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_letters
str_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：2000
2000是闰年！

Process finished with exit code 0

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