parameters: (tknzr, sentences, to_lower=True)
return_statement: return [tokenize(tknzr, s, to_lower) for s in sentences]
docstring: Arguments:
          - tknzr: a tokenizer implementing the NLTK tokenizer interface
          - sentences: a list of sentences
          - to_lower: lowercasing or not
docstring_summary: Arguments:
          - tknzr: a tokenizer implementing the NLTK tokenizer interface
          - sentences: a list of sentences
          - to_lower: lowercasing or not
docstring_tokens: Arguments : - tknzr : a tokenizer implementing the NLTK tokenizer interface - sentences : a list of sentences - to_lower : lowercasing or not
function: def tokenize_sentences(tknzr, sentences, to_lower=True):
      """Arguments:
          - tknzr: a tokenizer implementing the NLTK tokenizer interface
          - sentences: a list of sentences
          - to_lower: lowercasing or not
      """
      return [tokenize(tknzr, s, to_lower) for s in sentences]
function_tokens: def tokenize_sentences ( tknzr , sentences , to_lower = True ) : return [ tokenize ( tknzr , s , to_lower ) for s in sentences ]