Create (L[i], L[i+1]) tuple list from list L [duplicate]

Question

Say we have a list L = [1,2,3,4,5]. Is there a clean way to make a list of tuples of the following form: T = [(1,2),(2,3),(3,4),(4,5)]?

It would be great if there were a nicer alternative to

    T = []
    for i in range(len(L) - 1):
        T.append((L[i], L[i+1]))

Or the equivalent comprehension.

Answer 1

You can use the inbuilt zip function: zip(L, L[1:])

In [4]: L = [1,2,3,4,5]

In [5]: zip(L, L[1:])
Out[5]: [(1, 2), (2, 3), (3, 4), (4, 5)]

Answer 2

try:

list(zip(l[:-1], l[1:]))

This should do it.

note that

list(zip(l, l[1:]))

works as well, since zip cuts the longest guy, but its less explicit.