op.py

def plus_left(ast):
    return ast[1]

def plus_right(ast):
    return ast[2]

def minus_left(ast):
    return ast[1]

def minus_right(ast):
    return ast[2]

def mul_left(ast):
    return ast[1]

def mul_right(ast):
    return ast[2]

def div_left(ast):
    return ast[1]

def div_right(ast):
    return ast[2]

def eql_left(ast):
    return ast[1]

def eql_right(ast):
    return ast[2]

def neq_left(ast):
    return ast[1]

def neq_right(ast):
    return ast[2]

def less_left(ast):
    return ast[1]

def less_right(ast):
    return ast[2]

def leq_left(ast):
    return ast[1]

def leq_right(ast):
    return ast[2]

def grt_left(ast):
    return ast[1]

def grt_right(ast):
    return ast[2]

def grq_left(ast):
    return ast[1]

def grq_right(ast):
    return ast[2]