Python3调用有道云AI，进行文字识别

#coding=utf-8
import os
import json
import time
import random
import base64
import string
import hashlib
import requests
from dataclasses import dataclass


def get_img_base64str(image_file):
    """生成原始图片的base64编码数据,得到image参数"""
    if not isinstance(image_file, str):
        return None
    if not os.path.isfile(image_file):
        print('图片文件有误，请传入正确的文件路径')
        return None
    with open(image_file, 'rb') as fp:
        imgbase64 = base64.b64encode(fp.read())
        return imgbase64.decode()


@dataclass
class YouDaoAPIMsg(object):
    app_Key:     str
    secret_Key:  str
    api_url:     str
    image_file:  str

    def __post_init__(self):
        self.image = get_img_base64str(self.image_file)
        self.salt = str(random.randint(10000, 99999))

    def gen_sign_md5(self, req_dict):
        sign = req_dict['appKey'] + req_dict['img'] + \
               req_dict['salt'] + self.secret_Key
        md5 = hashlib.md5()
        md5.update(sign.encode())
        return md5.hexdigest().upper()

    def set_req_dict(self):
        """生成字典,得到请求参数,严格按照此代码顺序，避免排序"""
        req_dict = {
            'appKey':     self.app_Key,
            'img':        self.image,
            'detectType': '10012',
            'imageType':  '1',
            'langType':   "zh-en",
            'salt':       self.salt, }
        req_dict['sign'] = self.gen_sign_md5(req_dict)
        return req_dict

    def get_ocr_result(self):
        data = self.set_req_dict()
        text = requests.post(self.api_url, data=data)
        try:
            data = text.json()
            text = data['Result']['regions'][0]['lines']
            res = [word['text'] for word in text]
            return ''.join(res)
        except:
            print('获取结果失败，请检查各参数是否配置正确。')
            return ''


if __name__ == "__main__":
    app_Key    = '2**************2'                    #需要自己申请
    secret_Key = 'b******************************b'    #需要自己申请
    api_url    = "http://openapi.youdao.com/ocrapi"
    image_file = 'F:\\20180829193608871.jpg'

    Youdao = YouDaoAPIMsg(app_Key, secret_Key, api_url, image_file)
    text = Youdao.get_ocr_result()
    print(text)