python冒泡排序简单实现方法

#!/usr/bin/pythonimport randomdef bubble_sort(data):  length = len(data)  for i in range(len(data) - 1):   for j in range(len(data) - 1):    if (data[j] < data[j + 1]):        tmp = data[j]        data[j] = data[j + 1]        data[j + 1] = tmpr = random.Random()data = []for n in range(0, 20):  data.append(r.randint(1, 300))print data, len(data)bubble_sort(data)print data