Python实现希尔排序算法的原理与用法实例分析

#-*- coding: UTF-8 -*-
import numpy as np
def ShellSort(a):
  gap = a.size / 2
  while gap >= 1:
    for i in xrange(gap,a.size, gap):
      for j in xrange(i,0, -gap):
        if a[j-gap] > a[j]:
          a[j-gap] , a[j] = a[j], a[j-gap]
        else:
          break
    gap /= 2
if __name__ == '__main__':
  a = np.random.randint(0, 10, size = 10)
  print "Before sorting..."
  print "---------------------------------------------------------------"
  print a
  print "---------------------------------------------------------------"
  ShellSort(a)
  print "After sorting..."
  print "---------------------------------------------------------------"
  print a
  print "---------------------------------------------------------------"