如果是json檔案，需要讀取檔案，匯入json模組進行轉換後再進行處理。

with open('ip.json','r') as w:
　　json.loads(f.read())

# 隨機獲取一個ip進行代理
from urllib import request
# 匯入隨機模組
import random

# 獲取所有代理
def getProxy():
        data = [
            {"host": "116.31.75.100", "port": "3128"},
            {"host": "218.66.253.146", "port": "8800"},
            {"host": "218.66.253.144", "port": "8800"}
        ]

        proxies = []
        for p in data:
            proxy = {
                'http': 'http://' + p['host'] + ':' + p['port'],
                'https': 'http://' + p['host'] + ':' + p['port']
            }

            # 將proxy 追加到proxies列表中
            proxies.append(proxy)
        # 返回proxies
        return proxies

# 獲取一個opener
def getOpener(proxies):
    proxy = random.choice(proxies)
    proxy_handler = request.ProxyHandler(proxy)
    opener = request.build_opener(proxy_handler)
    return opener

# 製作下載器
def downloader(opener, req, proxies, timeout=5, retry=2):
    '''
    :param opener: 發請求
    :param req: 請求物件
    :param proxies:  代理列表
    :param timeout:  超時
    :param retry: 重試
    :return:
    '''
    try:
        response = opener.open(req,timeout=timeout)
        return response.read()
    except Exception as e:
        print(e)
        if retry > 0:
            opener = getOpener(proxies)  # 換了一個代理
            return downloader(opener,req,proxies,retry=retry-1)



if __name__ == '__main__':
    proxies = getProxy()
    opener = getOpener(proxies)
    # 檢視ip是否切換成功
    base_url = 'http://www.baidu.com/s?wd=ip'
    res = downloader(opener,base_url,proxies)
    print(res.decode('utf-8'))