'builtin_function_or_method' object is not subscriptable

Question

def binary_search(li, targetValue):
    low, high = 0, len[li] #error on this line
    while low <= high:
        mid = (high - low)/2
        if li[mid] == targetValue:
             return "we found it!"
        elif li[mid] > targetValue:
             low = mid - 1;
        elif li[mid] < targetValue:
             high = mid + 1;
    print "search failure "

just posted this question recently, but my code still doesn't work?

Answer 1

you are using the wrong brackets len(li) not len[li]

Remember when you are trying to access a function you need to use function(args) if you use [] you are actually accessing a sequence like a list. your_list[index]. len is a built in function so you need the ()

Answer 2

len is a built-in function, but you are trying to use it as a sequence:

len[li]

Call the function instead:

len(li)

Note the shape change there, indexing is done with square brackets, calling is done with round parentheses.