import operator


def add_globals(env):
    """ Adds built-in procedures and variables to env. """
    env.update({
        '+': operator.add,
        '-': operator.sub,
        '*': operator.mul,
        '/': operator.truediv,
        '>': operator.gt,
        '<': operator.lt,
        '>=': operator.ge,
        '<=': operator.le,
        '=': operator.eq
    })
    env.update({'True': True, 'False': False})
    return env