tokens: Pyparsing has the operatorPrecedence method that takes an expression for the basic operand definition , and a list of tuples to define each level of operators : an expression for the operators , an integer whether the operator is unary , binary , or ternary , and whether left - or right-associative .
ner_tags: B-Library O O B-Function O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Data_Type O O O O O O O O O O O O O O O O O O