冒泡排序python，常用的排序算法

# Seven-sorting-methods - This module aims to introduce the popular sorting methods including seven different schemes. All the implementation code are conducted by python 3 language. - 本文使用python 3实现常用的排序算法，包括：冒泡排序、直接插入排序、直接选择排序、希尔排序、归并排序、快速排序、堆排序。