python binary search
#blog.icodes.tech
def binary_search(item,my_list):
found=False
first=0
last=len(my_list)-1
while first <=last and found==False:
midpoint=(first+last)//2
if my_list[midpoint]==item:
found=True
else:
if my_list[midpoint]<item:
first=midpoint+1
else:
last=midpoint-1
return found