拓展 封装

from urllib import request, parse
from urllib.error import HTTPError, URLError

# a. get(url, headers=None)
def get(url, headers=None):
    return urlrequests(url, headers=headers)

# b. post(url, from, headers=None)
def post(url,form, headers=None):
    return urlrequests(url, form, headers=headers)

def urlrequests(url, form=None, headers=None):
    user_agent = 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36'
    # 如果用户需要自行传入session，则会覆盖之前的session
    if headers == None:
        headers = {
            'User-Agent':user_agent
        }
    html_bytes = b''
    try:
        if form:
            # POST
            # 2.1 转换成str
            form_str = parse.urlencode(form)
            # 2.2 转换成bytes
            form_bytes = form_str.encode('utf-8')
            req = request.Request(url, data= form_bytes, headers=headers)
        else:
            # GET
            req = request.Request(url, headers=headers)
        response = request.urlopen(req)
        html_bytes = response.read()

    except HTTPError as e:
        print(e)
    except URLError as e:
        print(e)
    return html_bytes

if __name__ == '__main__':
    # url = 'http://www.baidu.com'
    # html_byte = get(url)
    # print(html_byte)


    url = 'http://fanyi.baidu.com/sug'
    form = {
        'kw':'黄色'
    }
    html_bytes= post(url,form =form)
    print(html_bytes)