zhoudaxia233/Python：Iterating over every two elements in a list.md

## Python：Iterating over every two elements in a list.md

      
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              Python：Iterating over every two elements in a list.md
            
          
    Type 1:
from itertools import tee
def pairwise(iterable):
    "s -> (s0,s1), (s1,s2), (s2, s3), ..."
    a, b = tee(iterable)
    next(b, None)
    return zip(a, b)

Type 2:
def pairwise(iterable):
    "s -> (s0, s1), (s2, s3), (s4, s5), ..."
    a = iter(iterable)
    return zip(a, a)