必须掌握的Python技巧（一）

男娘i 2022-11-27 10:13 124阅读 0赞

### 文章目录 ###

*   *   *   *  1、重复元素判定
             *  2、字符元素组成是否相同的判定
             *  3、查看变量的内存占用
             *  4、查看字符串占用的字节数
             *  5、打印某个字符串n次，不需要循环
             *  6、切割列表的元素，分成指定元素个数(n)的若干个列表
             *  7、压缩：去掉布尔型元素
             *  8、解包：将打包好的列表按照类别分成元组
             *  9、链式对比
             *  10、逗号链接：join

#### 1、重复元素判定 ####

def If_uni(li):
        return len(li) == len(set(li))
    x = [1, 2, 3, 3, 4, 4, 5, 6, 7]
    y = [1, 2, 3, 4, 5]
    z = ('a', 'b', 'c', 1, 2, 3)
    v1 = If_uni(x)
    v2 = If_uni(y)
    v3 = If_uni(z)
    print(v1, v2, v3, sep='\n')

![11][]

#### 2、字符元素组成是否相同的判定 ####

from collections import Counter
    def anagram(one, two):
        return Counter(one) == Counter(two)
    v = anagram("abcd3", "3acdb")
    print(v)

![22][]

#### 3、查看变量的内存占用 ####

import sys
    v1 = 30
    v2 = "I love China!"
    print(sys.getsizeof(v1), sys.getsizeof(v2), sep='\n')

![33][]

#### 4、查看字符串占用的字节数 ####

def byte_size(string):
        return(len(string.encode('utf-8')))
    v1 = byte_size('')
    v2 = byte_size('Hello World')
    print(v1, v2, sep='\n')

#### 5、打印某个字符串n次，不需要循环 ####

n = 5
    s ="LoveYou"
    print(s * n)

![55][]

#### 6、切割列表的元素，分成指定元素个数(n)的若干个列表 ####

from math import ceil
    def chunk(lst, n):
        return list(
        map(lambda x: lst[x * n:x * n + n],
        list(range(0, ceil(len(lst) / n))))
        )
    v1 = chunk([1,2,3,4,5,6,7,8],3)
    print(v1)

![66][]

#### 7、压缩：去掉布尔型元素 ####

def compact(lst):
        return list(filter(bool, lst))
    v1 = compact([0, 1, False, 2, '', 3, 'a', 's', 34])
    print(v1)

![77][]

#### 8、解包：将打包好的列表按照类别分成元组 ####

a = [['a', 'b'], ['c', 'd'], ['e', 'f']]
    transposed = zip(*a)
    print(transposed)

![88][]

#### 9、链式对比 ####

a = 5
    print( 2 < a < 8)
    print(1 == a < 2)

![99][]

#### 10、逗号链接：join ####

hobbies = ["basketball", "football", "swimming"]
    print("My hobbies are: " + ", ".join(hobbies))

![10][]

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