1. 十六进制转十进制

print(int('da9', 16))  # 3497

2. 人类可读的日期时间

import time; print(time.ctime())  # Thu Aug 13 20:16:23 2020

3. 将列表元素的字符串类型转换为整型

list(map(int, ['1', '2', '3']))  # [1, 2, 3]

4. 按"键"对字典进行排序

# d = {'five': 5, 'one': 1, 'four': 4, 'eight': 8}  {key:d[key] for key in sorted(d.keys())}  # {'eight': 8, 'five': 5, 'four': 4, 'one': 1}

5. 按"值"对字典进行排序

# x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}  {k: v for k, v in sorted(x.items(), key=lambda item: item[1])}  # {0: 0, 2: 1, 1: 2, 4: 3, 3: 4}

6. 旋转列表

# li = [1,2,3,4,5]# right to left  li[n:] + li[:n] # n is the no of rotations  li[2:] + li[:2]  [3, 4, 5, 1, 2]# left to right  li[-n:] + li[:-n]  li[-1:] + li[:-1]   [5, 1, 2, 3, 4]

7. 从字符串中删除数字

''.join(list(filter(lambda x: x.isalpha(), 'abc123def4fg56vcg2')))  # abcdeffgvcg

8. 转置矩阵

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

9. 从列表中过滤偶数

list(filter(lambda x: x%2 == 0, [1, 2, 3, 4, 5, 6] ))  # [2, 4, 6]

10. 解包操作

a, *b, c = [1, 2, 3, 4, 5]  print(a) # 1  print(b) # [2, 3, 4]  print(c) # 5

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