python 下载 进度条

#1 【\r】要配合【print(printMsg, end='', flush=True)】的【flush】才能开头刷新

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import os import requests import time   # 进度条模块 def progressbar(url,path):     if not os.path.exists(path):   # 看是否有该文件夹，没有则创建文件夹          os.mkdir(path)     start = time.time() #下载开始时间     response = requests.get(url, stream=True)     size = 0    #初始化已下载大小     chunk_size = 1024  # 每次下载的数据大小     content_size = int(response.headers['content-length'])  # 下载文件总大小     try:         if response.status_code != 200:   #判断是否响应成功             print("response.status_code != 200")             return 0         if response.status_code == 200:   #判断是否响应成功             print('Start download,[File size]:{size:.2f} MB'.format(size = content_size / chunk_size /1024))   #开始下载，显示下载文件大小             filepath = r'{}\{}'.format(path,url[-5:])  #设置图片name，注：必须加上扩展名             # filepath =r'D:\tmp\images\123.jpg'             # print('filepath=========='+filepath)             with open(filepath,'wb') as file:   #显示进度条                 # print("+"*10)                 for data in response.iter_content(chunk_size = chunk_size):                       file.write(data)                     size +=len(data)                     # time.sleep(0.5)                     # print('\r'+'[download]:%s%.2f%%' % ('>'*int(size*50/ content_size), float(size / content_size * 100)) ,end=' ')                     msg='\r{}{:.2f}% '.format ('>'*int(size*50/ content_size), float(size / content_size * 100))                     # \r 就是每次打印回到行最开头                     print(msg ,end='', flush=True)         end = time.time()   #下载结束时间         print('\nDownload completed!,times: %.2fs' % (end - start), end='', flush=True)  #输出下载用时时间     except:         print('Error!')   def main():     #下载皮卡丘图片     url = 'https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=1783995481,3672177359&fm=26&gp=0.jpg'     # print("url[-10,-1]========="+url[-10:])     path = r'D:\tmp\images'  # 设置下载到本地的地址     progressbar(url,path)   if __name__ == '__main__':     main()