[Python] how to pair each 2 elements of a list?

I have a list like this

attach=['a','b','c','d','e','f','g','k']


I wanna pair each two elements that followed by each other:

lis2 = [('a', 'b'), ('c', 'd'), ('e', 'f'), ('g', 'k')]


I did the following:

Category=[]
for i in range(len(attach)):
if i+1< len(attach):
Category.append(f'{attach},{attach[i+1]}')


but then I have to remove half of rows because it also give 'b' ,'c' and so on. I thought maybe there is a better way

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