Python-pythonic积累

1

连接含有空值字符串，去空

words_list = "".join([i for i in strings if i != ' '])

2

生成随机整数列表

import random

lis = [random.randint(1,20) for i in range(10)]

3

生成随机整数二维列表

lis = [ [random.randint(1,10) for i in range(3)] for i in range(3)]

4

寻找列表中字符串最长公共前缀
*序列解包

    strs = ['flower', 'flow', 'flight']
    def longestCommonPrefix(strs) -> str:
        s = ''
        for i in zip(*strs):
            if len(set(i)) == 1:
                s += i[0]
            else:
                break
        return s 

5

对列表中的元素计数，当然也可以list.count(i)

for num in nums:
    count = sum(1 for elem in nums if elem == num)
# 另一种方式
import collections
counts = collections.Counter(nums)
# 获得值最大的键
max(counts.keys(), key=counts.get)

6

生成特定长度空数组（列表）

[None]*len(nums)

7

判断列表中有无重复元素

len(nums)==len(set(nums))

8.字典键值互换

id2word = {i: w for w, i in word2idx.items()}

9.获得一个列表里最长的元素

temp = ['asdffe','sfe','ef']
max(map(len, temp))