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Python 30段代码提升开发效率,高效实用

  • 2026-03-23 20:13:07
Python 30段代码提升开发效率,高效实用

在Python编程的世界里,简洁高效的代码往往能事半功倍。今天为大家整理了30个实用代码片段,覆盖日常开发中的高频场景,每个都短小精悍却威力无穷

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Python 50个实用代码片段,优雅高效

1. 列表去重保持顺序

defremove_duplicates(lst):seen = set()return [xforxinlstifnot (xinseenorseen.add(x))]# 示例original = [32123454]result = remove_duplicates(original)print(result)  # [3, 2, 1, 4, 5]

2. 字典键值反转

defreverse_dict(d):return {vkforkvind.items()}# 示例original = {'a'1'b'2'c'3}reversed_dict = reverse_dict(original)print(reversed_dict)  # {1: 'a', 2: 'b', 3: 'c'}

3. 统计元素频率

fromcollectionsimportCounterdata = ['apple''banana''apple''orange''banana''apple']freq = Counter(data)print(freq.most_common(2))  # [('apple', 3), ('banana', 2)]

4. 检查字符串是否为数字

defis_number(s):try:float(s)returnTrueexceptValueError:returnFalse# 示例print(is_number("123.45"))  # Trueprint(is_number("abc"))     # False

5. 生成随机字符串

importrandomimportstringdefrandom_string(length=8):chars = string.ascii_letters+string.digitsreturn''.join(random.choice(charsfor_inrange(length))# 示例print(random_string(10))  # 类似 "aB3dE7gH9j"

6. 字符串首字母大写

defcapitalize_words(s):return' '.join(word.capitalize() forwordins.split())# 示例text = "hello world python"print(capitalize_words(text))  # "Hello World Python"

7. 读取文件行数

defcount_lines(filename):withopen(filename'r'encoding='utf-8'asf:returnsum(1for_inf)# 示例line_count = count_lines('data.txt')print(f"文件共有 {line_count} 行")

8. 批量重命名文件

importosdefbatch_rename(folderprefix):forifilenameinenumerate(os.listdir(folder), 1):old_path = os.path.join(folderfilename)new_name = f"{prefix}_{i}{os.path.splitext(filename)[1]}"new_path = os.path.join(foldernew_name)os.rename(old_pathnew_path)

9. 计算日期差

fromdatetimeimportdatetimedefdays_between(date1date2):d1 = datetime.strptime(date1"%Y-%m-%d")d2 = datetime.strptime(date2"%Y-%m-%d")returnabs((d2-d1).days)# 示例days = days_between("2024-01-01""2024-03-20")print(f"相差 {days} 天")

10. 获取当前时间戳

importtimetimestamp = int(time.time())print(f"当前时间戳: {timestamp}")

11. 简单HTTP请求

importrequestsdeffetch_url(url):try:response = requests.get(urltimeout=5)returnresponse.status_coderesponse.text[:100]exceptrequests.RequestExceptionase:returnNonestr(e)# 示例statuscontent = fetch_url("https://httpbin.org/get")print(f"状态码: {status}")

12. 斐波那契数列(记忆化)

fromfunctoolsimportlru_cache@lru_cache(maxsize=None)deffibonacci(n):ifn<2:returnnreturnfibonacci(n-1+fibonacci(n-2)# 示例print(fibonacci(10))  # 55

13. 快速排序实现

defquick_sort(arr):iflen(arr<1:returnarrpivot = arr[len(arr)//2]left = [xforxinarrifx<pivot]middle = [xforxinarrifx == pivot]right = [xforxinarrifx>pivot]returnquick_sort(left+middle+quick_sort(right)# 示例data = [36810121]sorted_data = quick_sort(data)print(sorted_data)  # [1, 1, 2, 3, 6, 8, 10]

14. 进度条显示

defprogress_bar(iterationtotallength=50):percent = (iteration/total)filled_length = int(length*percent)bar = '█'*filled_length+'-'* (length-filled_length)print(f'\r|{bar}| {percent:.1%}'end='\r')ifiteration == total:print()# 示例total_items = 100foriinrange(total_items+1):progress_bar(itotal_items)time.sleep(0.01)

15. 内存使用监控

importsysdefmemory_usage(obj):returnsys.getsizeof(obj)# 示例data_list = [iforiinrange(1000)]print(f"列表占用内存: {memory_usage(data_list)} 字节")

16. 邮箱格式验证

importredefis_valid_email(email):pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'returnbool(re.match(patternemail))# 示例print(is_valid_email("test@example.com"))  # Trueprint(is_valid_email("invalid-email"))     # False

17. 密码强度检查

defcheck_password_strength(password):iflen(password<8:return"弱"has_upper = any(c.isupper() forcinpassword)has_lower = any(c.islower() forcinpassword)has_digit = any(c.isdigit() forcinpassword)has_special = any(notc.isalnum() forcinpassword)score = sum([has_upperhas_lowerhas_digithas_special])ifscore == 4:return"强"elifscore>2:return"中"else:return"弱"

18. 多线程任务执行

importthreadingimporttimedefworker(namedelay):print(f"线程 {name} 开始")time.sleep(delay)print(f"线程 {name} 结束")# 示例threads = []foriinrange(3):t = threading.Thread(target=workerargs=(f"Thread-{i}"i+1))threads.append(t)t.start()fortinthreads:t.join()

19. 优雅的错误处理装饰器

defhandle_errors(func):defwrapper(*args**kwargs):try:returnfunc(*args**kwargs)exceptExceptionase:print(f"错误发生: {type(e).__name__}: {e}")returnNonereturnwrapper@handle_errorsdefrisky_operation(xy):returnx/y# 示例result = risky_operation(100)  # 输出: 错误发生: ZeroDivisionError: division by zero

20. JSON与Python对象互转

importjsondefsave_to_json(datafilename):withopen(filename'w'encoding='utf-8'asf:json.dump(datafensure_ascii=Falseindent=2)defload_from_json(filename):withopen(filename'r'encoding='utf-8'asf:returnjson.load(f)# 示例data = {"name""张三""age"25"skills": ["Python""Java"]}save_to_json(data"user.json")loaded_data = load_from_json("user.json")print(loaded_data)

21. 素数判断

defis_prime(n):ifn<2:returnFalseforiinrange(2int(n**0.5+1):ifn%i == 0:returnFalsereturnTrue# 示例print(is_prime(17))  # Trueprint(is_prime(20))  # False

22. 最大公约数计算

defgcd(ab):whileb:ab = ba%breturna# 示例print(gcd(4818))  # 6

23. 中英文混合字符串长度计算

defmixed_string_length(s):chinese_count = sum(1forcinsif'\u4e00'<c<'\u9fff')english_count = len(s-chinese_countreturnchinese_count*2+english_count# 示例text = "Hello世界Python编程"print(f"混合长度: {mixed_string_length(text)}")  # 20

24. 获取系统信息

importplatformdefsystem_info():info = {"系统"platform.system(),"版本"platform.version(),"处理器"platform.processor(),"Python版本"platform.python_version()    }returninfo# 示例print(system_info())

25. 图片尺寸获取

fromPILimportImagedefget_image_size(image_path):withImage.open(image_pathasimg:returnimg.size# 示例widthheight = get_image_size("example.jpg")print(f"图片尺寸: {width}x{height}")

26. SQLite简单操作

importsqlite3defcreate_db():conn = sqlite3.connect('example.db')cursor = conn.cursor()cursor.execute('''CREATE TABLE IF NOT EXISTS users                     (id INTEGER PRIMARY KEY, name TEXT, age INTEGER)''')conn.commit()conn.close()

27. 提取网页链接

importredefextract_urls(text):pattern = r'https?://[^\s<>"]+|www\.[^\s<>"]+'returnre.findall(patterntext)# 示例html = '访问 <a href="https://www.example.com">示例网站</a> 和 http://test.com'urls = extract_urls(html)print(urls)  # ['https://www.example.com', 'http://test.com']

28. ZIP文件处理

importzipfiledefzip_files(fileszipname):withzipfile.ZipFile(zipname'w'aszipf:forfileinfiles:zipf.write(file)defunzip_file(zipnameextract_to):withzipfile.ZipFile(zipname'r'aszipf:zipf.extractall(extract_to)

29. 函数执行时间测量

importtimedeftimer(func):defwrapper(*args**kwargs):start = time.perf_counter()result = func(*args**kwargs)end = time.perf_counter()print(f"{func.__name__} 执行时间: {end - start:.6f}秒")returnresultreturnwrapper@timerdefslow_function():time.sleep(1)return"完成"# 示例slow_function()

30. 简单数据标准化

defnormalize_data(data):min_val = min(data)max_val = max(data)return [(x-min_val/ (max_val-min_valforxindata]# 示例original = [1020304050]normalized = normalize_data(original)print(normalized)  # [0.0, 0.25, 0.5, 0.75, 1.0]

这30个Python代码片段涵盖了从基础到进阶的多个应用场景,力求在最短的代码中实现最大的功能。掌握这些技巧不仅能提升编程效率,还能写出更优雅、更Pythonic的代码。

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  1. CONNECT:[ UseTime:0.001046s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001455s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000769s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000633s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001083s ]
  6. SELECT * FROM `set` [ RunTime:0.000555s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001375s ]
  8. SELECT * FROM `article` WHERE `id` = 482288 LIMIT 1 [ RunTime:0.001494s ]
  9. UPDATE `article` SET `lasttime` = 1774582966 WHERE `id` = 482288 [ RunTime:0.006438s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000695s ]
  11. SELECT * FROM `article` WHERE `id` < 482288 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000961s ]
  12. SELECT * FROM `article` WHERE `id` > 482288 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001307s ]
  13. SELECT * FROM `article` WHERE `id` < 482288 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001595s ]
  14. SELECT * FROM `article` WHERE `id` < 482288 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002569s ]
  15. SELECT * FROM `article` WHERE `id` < 482288 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003834s ]
0.237754s