Python对接支付宝支付自实现功能

# -*- coding: utf-8 -*-
import base64
import json
import urllib.parse
from datetime import datetime
import requests
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import padding
class AliPayException(Exception):
  def __init__(self, data):
    super(AliPayException, self).__init__()
    self.data = data
  def __str__(self):
    return "alipay - {}".format(self.data)
  def __unicode__(self):
    return u"alipay - {}".format(self.data)
class AliPayVerifyException(AliPayException):
  def __init__(self, msg, data):
    super(AliPayVerifyException, self).__init__('alipay verify except - {}:{}'.format(msg, data))
class AliPay:
  def __init__(self, **kwargs):
    """
    :param kwargs: