CoNLL-U format parser for Python. The conllu library is a lightweight, dependency-free parser for the CoNLL-U format. It provides a simple API to parse CoNLL-U formatted strings into Python data structures. CoNLL is a family of plain text file formats to annotate natural language. CoNLL-U is a plain text file format used by the Universal Dependencies project to annotate natural language, with each sentence's words or tokens represented by a line of 10 tab-separated fields.