Why we use " len(list)-1 " instead of " len(list) " please help me , thank you

Question

start = 0
def praneeth(list,start,end,key):
while(start <= end):
mid = start+end//2
if list[mid] == key:
return mid
elif list[mid] < key:
start = mid+1
else:
end = mid-1
return -1
list = [10,20,30,40,50,60,70,80,88,90,100]
key = 20
kumar = praneeth(list,0,len(list)-1,key)
if kumar != -1:
print(kumar)
else:
print("Number not found")

Answer 1

because 'end' argument is supposed to be included, and indexes start at zero ^^

Answer 2

Praneeth Kumar in range, end argument is not included ^^

Answer 3

in your function you are testing if start<=end, so end is included...
in range, end is not included ;)

Answer 4

no: range(0,end) is same that range(end)

Answer 5

range(3) is same as [0,1,2]

Answer 6

But in for loop we use
for i in range(len(list))
Not using len(list)-1

Answer 7

for i in range(0,len(list)-1):
And
for i in range(len(list)):
Both are same ????

Answer 8

yes, default start value is zero...