renew keyword-sorting

Author: linjing-lab

README.md

@@ -64,6 +64,24 @@ I test the performance of the sorting algorithm after adding the keyword sorting
 
 The design of reverse sorting of all methods is completely correct, and the design of keyword sorting based on bubble sorting optimized is feasible, which is consistent with the usage of *sorted* parameter officially released by Python.
 
+The examples of keyword sorting are underlying:
+
+```python
+data = [('Alex', 100, 90, 98, 95), ('Jack', 97, 89, 92, 99), ('Peter', 92, 95, 92, 96), ('Li', 97, 88, 98, 92)]
+bubble_sort(data, key=lambda x:(x[1], x[2]), reverse=True)
+print(data)
+
+'''
+reverse=False:
+[('Peter', 92, 95, 92, 96), ('Li', 97, 88, 98, 92), ('Jack', 97, 89, 92, 99), ('Alex', 100, 90, 98, 95)]
+
+reverse=True:
+[('Alex', 100, 90, 98, 95), ('Jack', 97, 89, 92, 99), ('Li', 97, 88, 98, 92), ('Peter', 92, 95, 92, 96)]
+'''
+```
+
+you can see more examples in [*test_key*](./test_key.py) file.
+
 ## LICENSE
 
 [MIT LICENSE](./LICENSE)

test_key.py

@@ -1,7 +1,6 @@
-from typing import List
 from utils import cmp
 
-def bubble_sort(array: List, key=None, reverse: bool=False) -> None:
+def bubble_sort(array: list, key=None, reverse: bool=False) -> None:
     '''
     array: 同一数据维度下，支持数值型数据，如整型与浮点型混合；支持全为字符串类型的数据；不支持字符串型与数值型混合。
     key: lambda函数, 仅含一个参量，用于关键字排序, 例如: key=lambda x: x[1], key=lambda x: (x[0], x[1])