from flair.data import Sentence s = Sentence("I love programming in Python") s.add_token("Python", "PROG")In this code snippet, we first create a new Sentence object "s" with the text "I love programming in Python". We then use the add_token method to add a new token "Python" with the tag "PROG" to this sentence. The flair.data package is a part of the Flair NLP library, which is an open-source framework for natural language processing developed by Zalando Research. The package provides a range of powerful tools and features for text data analysis, including support for text classification, named entity recognition, and embeddings generation. It can be easily installed using pip, and is compatible with both Python 2 and 3.