Python 語法簡潔，能夠用一行代碼實(shí)現(xiàn)很多有趣的功能，現(xiàn)在整理 30 個(gè)常見的 Python 一行代碼集合。

① 轉(zhuǎn)置矩陣

old_list = [[1, 2, 3], [3, 4, 6], [5, 6, 7]] list(list(x) for x in zip(*old_list)) [[1, 3, 5], [2, 4, 6], [3, 6, 7]]

② 二進(jìn)制轉(zhuǎn)十進(jìn)制

decimal = int('1010', 2) print(decimal) #10 10

③ 字符串大寫轉(zhuǎn)小寫

# 方法一 lower() "Hi my name is Allwin".lower() # 'hi my name is allwin' # 方法二 casefold() "Hi my name is Allwin".casefold() # 'hi my name is allwin' 'hi my name is allwin'

④ 字符串小寫轉(zhuǎn)大寫

"hi my name is Allwin".upper() # 'HI MY NAME IS ALLWIN' 'HI MY NAME IS ALLWIN'

⑤ 將字符串轉(zhuǎn)換為字節(jié)

"convert string to bytes using encode method".encode() # b'convert string to bytes using encode method' b'convert string to bytes using encode method'

⑥ 復(fù)制文件內(nèi)容

import shutil; shutil.copyfile('source.txt', 'dest.txt') 'dest.txt'

⑦ 快速排序

qsort = lambda l : l if len(l)<=1 else qsort([x for x in l[1:] if x < l[0]]) + [l[0]] + qsort([x for x in l[1:] if x >= l[0]]) qsort([1,3,2]) [1, 2, 3]

⑧ n 個(gè)連續(xù)數(shù)之和

n = 3 sum(range(0, n+1)) 6

⑨ 交換兩個(gè)變量

a=1 b=2 a,b = b,a

⑩ 斐波那契數(shù)列

fib = lambda x: x if x<=1 else fib(x-1) + fib(x-2) fib(10) 55

? 將嵌套列表合并為一個(gè)列表

main_list = [[1,2],[3,4],[5,6,7]] [item for sublist in main_list for item in sublist] [1, 2, 3, 4, 5, 6, 7]

? 運(yùn)行 HTTP 服務(wù)器

python3 -m http.server 8000

? 反轉(zhuǎn)列表

numbers = 'I Love China' numbers[::-1] 'anihC evoL I'

? 返回階乘

import math; fact_5 = math.factorial(5) fact_5 120

? 判斷列表推導(dǎo)式

even_list = [number for number in [1, 2, 3, 4] if number % 2 == 0] even_list [2, 4]

? 取最長字符串

words = ['This', 'is', 'a', 'list', 'of', 'words'] max(words, key=len) 'words'

? 列表推導(dǎo)式

li = [num for num in range(0,100)] # this will create a list of numbers from 0 to 99

? 集合推導(dǎo)式

num_set = { num for num in range(0,100)} # this will create a set of numbers from 0 to 99

? 字典推導(dǎo)式

dict_numbers = {x:x*x for x in range(1,5) } # {1: 1, 2: 4, 3: 9, 4: 16}

? if-else

print("even") if 4%2==0 else print("odd") even

? 無限循環(huán)

while 1:0

? 檢查數(shù)據(jù)類型

isinstance(2, int) isinstance("allwin", str) isinstance([3,4,1997], list)

? while 循環(huán)

a=5 while a > 0: a = a - 1; print(a)

? 使用 print 語句寫入到文件里

print("Hello, World!", file=open('source.txt', 'w'))

? 統(tǒng)計(jì)字頻

print("umbrella".count('l')) 2

? 合并兩個(gè)列表

list1.extend(list2) # contents of list 2 will be added to the list1

? 合并兩個(gè)字典

dict1.update(dict2) # contents of dictionary 2 will be added to the dictionary 1

? 合并兩個(gè)集合

set1.update(set2) # contents of set2 will be copied to the set1

? 時(shí)間戳

import time; print(time.time()) 1632146103.8406303

? 統(tǒng)計(jì)最多的元素

test_list = [9, 4, 5, 4, 4, 5, 9, 5, 4] most_frequent_element = max(set(test_list), key=test_list.count) most_frequent_element

最后，Python 代碼哲學(xué)崇尚簡潔，伙伴們也可以嘗試把代碼簡化，看能不能實(shí)現(xiàn)想要的功能。

總結(jié)

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