names = [('Josh', 'Belluga'), ('Daisy', 'Fox'), ('Elin', 'Grosefield'), ('Mike', 'Levinsan')]

def find_name(lst,name,low,high):
if name == lst[high]:
    return high
if name == lst[low]:
    return low
if low >= high:
    return None
middle = (low + high) / 2
if lst[middle] == name:
    return middle
**if lst[middle] > name:**
    return find_name(lst, name, low, middle*1)

return find_name(lst, name, middle + 1,high)