Environment for simple lisp

env.py

Env = dict

def starndard_env():
    import operator as op
    env = Env()
    env.update({
    '+': op.add,
    '-': op.sub,
    '*': op.mul,
    '/': op.truediv,
    '>': op.gt,
    '<':op.lt,
    '>=': op.ge,
    '<=': op.le,
    '=': op.eq,
    })
    return env

global_env = starndard_env()