range_operator.py

#!/usr/bin/python
# coding: utf8

"""
 Contains:
     - operators: python ast operator node
     - logical operators: python ast comparison operator
     - comparison sign: comparison operator sign
     - opposite comparison: comparison operator associated to its opposite operator
"""

import ast
import operator

operators = {ast.Add: operator.add,
             ast.Sub: operator.sub,
             ast.Mult: operator.mul,
             ast.Div: operator.truediv,
             ast.Pow: operator.pow,
             ast.BitXor: operator.xor,
             ast.USub: operator.neg
            }

logical_operators = {ast.Eq: operator.eq,
                     ast.NotEq: operator.ne,
                     ast.Lt: operator.lt,
                     ast.LtE: operator.lt,
                     ast.Gt: operator.gt,
                     ast.GtE: operator.ge
                    }

comparison_sign = {ast.Eq: "==",
                   ast.NotEq: "!=",
                   ast.Lt: "<",
                   ast.LtE: "<=",
                   ast.Gt: ">",
                   ast.GtE: ">="
                  }

opposite_comparison = {ast.Eq: ast.NotEq,
                       ast.NotEq: ast.Eq,
                       ast.Lt: ast.GtE,
                       ast.LtE: ast.Gt,
                       ast.Gt: ast.LtE,
                       ast.GtE: ast.Lt
                      }