利用Python实现百度API的调用

1。先要注册百度API成为开发者，

下面是开发者申请链接：

http://api.fanyi.baidu.com/api/trans/product/index

为方便使用，百度翻译开放平台提供了详细的接入文档，链接如下：

http://api.fanyi.baidu.com/api/trans/product/apidoc

在翻译文档中列出了详细的使用方法，以下是接入文档原文：

例：将apple从英文翻译成中文：

请求参数：

q=apple

from=en

to=zh

appid=2015063000000001

salt=1435660288

平台分配的密钥: 12345678

生成sign：

>拼接字符串1

拼接appid=2015063000000001+q=apple+salt=1435660288+密钥=12345678

得到字符串1 =2015063000000001apple143566028812345678

>计算签名sign（对字符串1做md5加密，注意计算md5之前，串1必须为UTF-8编码）

sign=md5(2015063000000001apple143566028812345678)

sign=f89f9594663708c1605f3d736d01d2d4

完整请求为：

http://api.fanyi.baidu.com/api/trans/vip/translate?q=apple&from=en&to=zh&appid=2015063000000001&salt=1435660288&sign=f89f9594663708c1605f3d736d01d2d4

签名sign的生成

通过Python提供的hashlib模块中的hashlib.md5()可以实现签名计算

以接入文档中的字符串为例：

import hashlib
m = '2015063000000001apple143566028812345678'
m_MD5 = hashlib.md5(m)
sign = m_MD5.hexdigest()
print 'm = ',m
print 'sign = ',sign

得到签名之后，按照接入文档中要求，生成URL请求，提交后可返回翻译结果。以下是接入文档提供的字段以及对应描述的截图：

{"from":"en","to":"zh","trans_result":[{"src":"apple","dst":"u82f9u679c"}]} 

解析返回结果

提交URL后的返回值为json格式，使用json模块可以对结果进行解析：

import json
result = '{"from":"en","to":"zh","trans_result":[{"src":"apple","dst":"u82f9u679c"}]}'
data = json.loads(result)
print data['trans_result'][0]['dst']

以上就是API调用的所有程序。

--------------------------------------------------------------------------------------------------------------------------------------------------------------

官方给定的demo，经验证，可执行。

# -*- coding:utf-8 -*-
import httplib
import md5
import urllib
import random
import codecs

result = codecs.open('result1', 'w', encoding='utf-8')
appid = '20170406000044276'
secretKey = 'Q6g9YuaGq8Cqp0vnu2Cj'

httpClient = None
myurl = '/api/trans/vip/translate'
q = 'My name is Xiaobing.'
fromLang = 'en'
toLang = 'zh'
salt = random.randint(32768, 65536)

sign = appid + q + str(salt) + secretKey
m1 = md5.new()
m1.update(sign)
sign = m1.hexdigest()
myurl = myurl + '?appid=' + appid + '&q=' + urllib.quote(q) + '&from=' + fromLang + '&to=' + toLang + '&salt=' + str(
    salt) + '&sign=' + sign

try:
    httpClient = httplib.HTTPConnection('api.fanyi.baidu.com')
    httpClient.request('GET', myurl)

    # response是HTTPResponse对象
    response = httpClient.getresponse()
    sentence = response.read()
    print sentence.decode('unicode_escape')
    #print sentence.encode('utf-8')
    result.write(sentence.decode('unicode_escape'))
except Exception, e:
    print e
finally:
    if httpClient:
        httpClient.close()
result.close()
---------------------------------------重新安装了Python版本3.6.2之后，因为Python的不兼容性，代码改为如下---------------------

import http.client
import hashlib
import json
import urllib
import random


def baidu_translate(content):
    appid = '20170406000044276'
    secretKey = 'Q6g9YuaGq8Cqp0vnu2Cj'
    httpClient = None
    myurl = '/api/trans/vip/translate'
    q = content
    fromLang = 'en'  # 源语言
    toLang = 'zh'  # 翻译后的语言
    salt = random.randint(32768, 65536)
    sign = appid + q + str(salt) + secretKey
    sign = hashlib.md5(sign.encode()).hexdigest()
    myurl = myurl + '?appid=' + appid + '&q=' + urllib.parse.quote(
        q) + '&from=' + fromLang + '&to=' + toLang + '&salt=' + str(
        salt) + '&sign=' + sign

    try:
        httpClient = http.client.HTTPConnection('api.fanyi.baidu.com')
        httpClient.request('GET', myurl)
        # response是HTTPResponse对象
        response = httpClient.getresponse()
        jsonResponse = response.read().decode("utf-8")  # 获得返回的结果，结果为json格式
        js = json.loads(jsonResponse)  # 将json格式的结果转换字典结构
        dst = str(js["trans_result"][0]["dst"])  # 取得翻译后的文本结果
        print(dst)  # 打印结果
    except Exception as e:
        print(e)
    finally:
        if httpClient:
            httpClient.close()


if __name__ == '__main__':
    while True:
        print("请输入要翻译的内容,如果退出输入q")
        content = input()
        if (content == 'q'):
            break
        baidu_translate(content)
------------------------------------------------------------------------------------------------------------------------------
单个句子的翻译目前没什么问题 但是替换成翻译一个文档的话 究竟文档的读写应该放在哪里比较效率高？翻译一句 就请求一次吗？还是怎么。。。
文件读写式的翻译：

#-*- coding: utf-8 -*-
import http.client
import hashlib
import json
import urllib
import random
import codecs


def baidu_translate(content):
    appid = '20170406000044276'
    secretKey = 'Q6g9YuaGq8Cqp0vnu2Cj'
    httpClient = None
    myurl = '/api/trans/vip/translate'
    q = content
    fromLang = 'zh'  # 源语言
    toLang = 'en'  # 翻译后的语言
    salt = random.randint(32768, 65536)
    sign = appid + q + str(salt) + secretKey
    sign = hashlib.md5(sign.encode()).hexdigest()
    myurl = myurl + '?appid=' + appid + '&q=' + urllib.parse.quote(
        q) + '&from=' + fromLang + '&to=' + toLang + '&salt=' + str(
        salt) + '&sign=' + sign

    try:
        httpClient = http.client.HTTPConnection('api.fanyi.baidu.com')
        httpClient.request('GET', myurl)
        # response是HTTPResponse对象
        response = httpClient.getresponse()
        jsonResponse = response.read().decode("utf-8")  # 获得返回的结果，结果为json格式
        js = json.loads(jsonResponse)  # 将json格式的结果转换字典结构
        dst = str(js["trans_result"][0]["dst"])  # 取得翻译后的文本结果
        print(dst)  # 打印结果
        return dst
    except Exception as e:
        print(e)
    finally:
        if httpClient:
            httpClient.close()


if __name__ == '__main__':
    inputFile = codecs.open("input.txt", "rb", "utf-8")
    outputFile = codecs.open("output.txt","wb","utf-8")
    for line in inputFile.readlines():
        if line.split():
            resultline = ''
            content = line.split()
            if content == 'q':
                break
            resultline = baidu_translate(str(content))
            outputFile.write(resultline + "
")