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3个Python冷门小技巧,新手也能秒提效率!

  • 2026-01-24 04:40:54
3个Python冷门小技巧,新手也能秒提效率!

宝子们,是不是刚学Python就陷入“代码写得又长又慢”的怪圈?明明实现一个功能,别人几行代码搞定,你却写满屏嵌套循环?

别慌!今天分享3个冷门但巨好用的Python小技巧,新手也能直接抄作业,效率直接翻倍!

🔥 技巧1:用enumerate(),告别手动计数的蠢办法

刚学Python时,遍历列表想同时拿到索引和值,是不是总这么写?

python  

fruits = ["apple", "banana", "orange"]

index = 0

for fruit in fruits:

    print(index, fruit)

    index += 1

又麻烦又容易忘写 index += 1 ,简直是新手噩梦!

一招搞定:直接用 enumerate() ,索引和值一步到位!

python  

fruits = ["apple", "banana", "orange"]

for index, fruit in enumerate(fruits, start=1):  # start=1 让索引从1开始

    print(index, fruit)

输出直接清爽:

plaintext  

1 apple

2 banana

3 orange

✨ 实用场景:批量处理数据、生成带序号的报告,再也不用手动维护计数器!

🔥 技巧2:defaultdict(),专治字典“键不存在”报错

新手写字典最崩溃的瞬间:想给字典新增键赋值,结果直接报 KeyError !

python  

student_scores = {}

student_scores["小明"].append(90)  # 直接报错 KeyError: '小明'

明明只想优雅地给小明加个分数,却要先判断键存不存在,太麻烦!

救命神器: collections.defaultdict ,自动给不存在的键创建默认值!

python  

from collections import defaultdict

student_scores = defaultdict(list)  # 默认值是空列表

student_scores["小明"].append(90)

student_scores["小红"].append(85)

print(dict(student_scores))

输出完美符合预期:

plaintext  

{'小明': [90], '小红': [85]}

✨ 实用场景:统计数据、分组归类,比如统计每个单词出现的次数,再也不用写 if key in dict 的判断!

🔥 技巧3:zip(),让多个列表“手拉手”遍历

想同时遍历两个甚至多个列表,新手是不是总写嵌套循环?

python  

names = ["小明", "小红", "小刚"]

scores = [90, 85, 95]

for i in range(len(names)):

    print(names[i], scores[i])

代码又丑又容易出错,要是列表长度不一样,直接翻车!

神仙方法:用 zip() 把多个列表打包成“配对元组”,遍历超丝滑!

python  

names = ["小明", "小红", "小刚"]

scores = [90, 85, 95]

for name, score in zip(names, scores):

    print(f"{name}:{score}分")

输出干净利落:

plaintext  

小明:90分

小红:85分

小刚:95分

⚠️ 避坑提醒:如果列表长度不同, zip() 会以最短的列表为准截断,想保留全部元素可以用 itertools.zip_longest !

💡 最后唠两句

Python的精髓就是“简洁优雅”,很多时候不是你写得不够好,而是没找对工具!

这3个小技巧看着简单,但真正用在项目里,能少写几十行冗余代码,还能减少bug。

💬 互动时间:你还知道哪些Python冷门小技巧?评论区分享出来,一起卷死面试官!

🎁 福利时间:关注公众号,回复【Python技巧】,领取《Python新手避坑指南+常用函数速查表》!

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  1. CONNECT:[ UseTime:0.000631s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000802s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000346s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002445s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000619s ]
  6. SELECT * FROM `set` [ RunTime:0.000243s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000748s ]
  8. SELECT * FROM `article` WHERE `id` = 461361 LIMIT 1 [ RunTime:0.001239s ]
  9. UPDATE `article` SET `lasttime` = 1770603907 WHERE `id` = 461361 [ RunTime:0.008078s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000752s ]
  11. SELECT * FROM `article` WHERE `id` < 461361 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000651s ]
  12. SELECT * FROM `article` WHERE `id` > 461361 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001751s ]
  13. SELECT * FROM `article` WHERE `id` < 461361 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004009s ]
  14. SELECT * FROM `article` WHERE `id` < 461361 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005598s ]
  15. SELECT * FROM `article` WHERE `id` < 461361 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014661s ]
0.120853s