The Sentence module represents an entire CoNLL sentence, which is composed of comments and tokens.
Comments are treated as key-value pairs, separated by the = character. A singleton comment has no = present. In this situation the key is the comment string, and the value is None. Methods for reading and writing cmoments on Sentences are prefixed with meta_, and are found below.
For convenience, the id and text comments are accessible through member properties on the Sentence in addition to metadata methods. So sentence.id and sentence.meta_value('id') are equivalent but the former is more concise and readable. Since this API does not support changing a token's form, the text comment cannot be changed. Text translations or transliterations can still be added just like any other comment.
In previous versions of pyconll, the document and paragraph id of a Sentence were extracted similar to text and id information. This causes strange results and semantics when adding Sentences to a Conll object since the added sentence may have a newpar or newdoc comment which affects all subsequent Sentence ids. For simplicity's sake, this information is now only directly available as normal metadata information.
This is the heart of the sentence. Tokens can be indexed on Sentences through their id value, as a string, or as a numeric index. So all of the following calls are valid, sentence['5'], sentence['2-3'], sentence['2.1'], and sentence[2]. Note that sentence[x] and sentence[str(x)] are not interchangeable. These calls are both valid but have different meanings.
pyconll.unit.sentence