Python一行代碼能做什么,30個實用案例代碼詳解
Python語法簡潔,能夠用一行代碼實現(xiàn)很多有趣的功能,這次來整理30個常見的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、二進制轉(zhuǎn)十進制
- 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個連續(xù)數(shù)之和
- n = 3
- sum(range(0, n+1))
6
9、交換兩個變量
- 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
11、將嵌套列表合并為一個列表
- 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]
12、運行 HTTP 服務(wù)器
- python3 -m http.server 8000
13、反轉(zhuǎn)列表
- numbers = 'I Love China'
- numbers[::-1]
'anihC evoL I'
14、返回階乘
- import math; fact_5 = math.factorial(5)
- fact_5
120
15、判斷列表推導式
- even_list = [number for number in [1, 2, 3, 4] if number % 2 == 0]
- even_list
[2, 4]
16、取最長字符串
- words = ['This', 'is', 'a', 'list', 'of', 'words']
- max(words, key=len)
'words'
17、列表推導式
- li = [num for num in range(0,100)]
- # this will create a list of numbers from 0 to 99
18、集合推導式
- num_set = { num for num in range(0,100)}
- # this will create a set of numbers from 0 to 99
19、字典推導式
- dict_numbers = {x:x*x for x in range(1,5) }
- # {1: 1, 2: 4, 3: 9, 4: 16}
20、if-else
- print("even") if 4%2==0 else print("odd")
even
21、無限循環(huán)
- while 1:0
22、檢查數(shù)據(jù)類型
- isinstance(2, int)
- isinstance("allwin", str)
- isinstance([3,4,1997], list)
23、while循環(huán)
- a=5
- while a > 0: a = a - 1; print(a)
24、使用print語句寫入到文件里
- print("Hello, World!", file=open('source.txt', 'w'))
25、統(tǒng)計字頻
- print("umbrella".count('l'))
2
26、合并兩個列表
- list1.extend(list2)
- # contents of list 2 will be added to the list1
27、合并兩個字典
- dict1.update(dict2)
- # contents of dictionary 2 will be added to the dictionary 1
28、合并兩個集合
- set1.update(set2)
- # contents of set2 will be copied to the set1
29、時間戳
- import time; print(time.time())
1632146103.8406303
30、統(tǒng)計最多的元素
- 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代碼哲學崇尚簡潔,伙伴們也可以嘗試把代碼簡化,看能不能實現(xiàn)想要的功能。