import os,stat
import urllib.request

img_url="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1516371301&di=d99af0828bb301fea27c2149a7070" \
        "d44&imgtype=jpg&er=1&src=http%3A%2F%2Fupload.qianhuaweb.com%2F2017%2F0718%2F1500369506683.jpg"
file_path='D:/book/img'
file_name ="pyt"

try:
    #是否有這個路徑
    if not os.path.exists(file_path):
    #建立路徑
        os.makedirs(file_path)
        #獲得圖片字尾
    file_suffix = os.path.splitext(img_url)[1]
    print(file_suffix)
        #拼接圖片名（包含路徑）
    filename = '{}{}{}{}'.format(file_path,os.sep,file_name,file_suffix)
    print(filename)
       #下載圖片，並儲存到資料夾中
    urllib.request.urlretrieve(img_url,filename=filename)

except IOError as e:
    print("IOError")
except Exception as e:
    print("Exception")
 

二：利用讀寫操作寫入檔案，具體程式碼：

import os,stat
import urllib.request

for i in range(1,3):
    if not os.path.exists("./rym"):
        print("不純在")
        os.makedirs("./rym")

    else:
        print("存在")
        os.chmod("D:/imagss",777)


        with urllib.request.urlopen("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1516371301&di=d99af0828b"
                                    "b301fea27c2149a7070d44&imgtype=jpg&er=1&src=http%3A%2F%2Fupload.qianhuaweb.com%2F2017%2F0718%"
                                    "2F1500369506683.jpg", timeout=30) as response, open("./rym/lyj.png"
                , 'wb') as f_save:
            f_save.write(response.read())
            f_save.flush()
            f_save.close()
            print("成功")