python搜索算法原理及实例讲解

def linear_search(data, search_for):
 """线性搜索"""
 search_at = 0
 search_res = False
 while search_at < len(data) and search_res is False:
 if data[search_at] == search_for:
  search_res = True
 else:
  search_at += 1
 return search_res
lis = [5, 10, 7, 35, 12, 26, 41]
print(linear_search(lis, 12))
print(linear_search(lis, 6))

def insert_search(data,x):
 """插值搜索"""
 idx0 = 0
 idxn = (len(data) - 1)
 while idx0 <= idxn and x >= data[idx0] and x <= data[idxn]:
 mid = idx0 +int(((float(idxn - idx0)/(data[idxn] - data[idx0])) * (x - data[idx0])))
 if data[mid] == x:
  return "在下标为"+str(mid) + "的位置找到了" + str(x)
 if data[mid] < x:
  idx0 = mid + 1
 return "没有搜索到" + str(x)
 
 
lis = [2, 6, 11, 19, 27, 31, 45, 121]
print(insert_search(lis, 31))
print(insert_search(lis, 3))