Sometimes, we want to iterate a list as pair (current, next) in Python.
In this article, we’ll look at how to iterate a list as pair (current, next) in Python.
How to iterate a list as pair (current, next) in Python?
To iterate a list as pair (current, next) in Python, we can use the itertools.tee method.
For instance, we write
import itertools
def pairwise(iterable):
a, b = itertools.tee(iterable)
next(b, None)
return zip(a, b)
to call itertools.tee with the iterable object to return an iterator with the tuples that has the current and next item values each in their own lists.
Then we call next to get the values.
And then we call zip with a and b to combine them into a list with tuples containing the current and next item values and return it.
Conclusion
To iterate a list as pair (current, next) in Python, we can use the itertools.tee method.
