Is there a need for range(len(a))?

Question

One frequently finds expressions of this type in python questions on SO. Either for just accessing all items of the iterable

for i in range(len(a)):
    prin         


        

Answer 1

What if you need to access two elements of the list simultaneously?

for i in range(len(a[0:-1])):
    something_new[i] = a[i] * a[i+1]

You can use this, but it's probably less clear:

for i, _ in enumerate(a[0:-1]):
     something_new[i] = a[i] * a[i+1]

Personally I'm not 100% happy with either!