Need to know the necessary to study nltk for python.
You don’t need to study nltk to learn Python. Thousands of Python
programmers have never even heard of nltk, and tens of thousands have
never used it.
(“Natural Language Tool Kit”.)
But if you want to use the nltk libraries, it would be very, very
helpful to know Python well. You can’t use it at all without knowing at
least a little bit of Python.