Python 201 - Interactively Learn Advanced Concepts in Python 3/

...

/

takewhile(), tee() and zip_longest()

takewhile(), tee() and zip_longest()

Let's figure out the iterators that do not terminate. i.e. takewhile(), tee() and zip_longest().

We'll cover the following...

takewhile(predicate, iterable)

The takewhile module is basically the opposite of the dropwhile iterator that we looked at earlier. takewhile will create an iterator that returns elements from the iterable only as long as our predicate or filter is True. Let’s try a simple example to see how it works:

Press + to interact
from itertools import takewhile
print (list(takewhile(lambda x: x<5, [1,4,6,4,1])))
#[1, 4]

Here we run takewhile using a lambda function and a list. The ...