二分法查找python的实现

def BinSearch(ls, value):

"""

使用二分法查找时列表内的元素必须是已经排好序的

:param ls:

:param value:

:return:

"""

minValue = 0

maxValue = len(ls) - 1

 

if value in ls:

while True:

center = int((minValue + maxValue) / 2)

if ls[center] > value:

maxValue = center - 1

 

elif ls[center] < value:

minValue = center + 1

 

elif ls[center] == value:

print("元素的索引是%s" % center)

break

 

else:

print("没有找到元素 %s" % value)

 

 

if __name__ == "__main__":

# datas = range(1, 1000)

datas = [88, 55, 22, 11, 99, 66, 77]

datas.sort()

print(datas)

BinSearch(datas, 88)