[Python] Download Little Helper

import requests  
from contextlib import closing

class ProgressBar(object):  
    def __init__(self, title, count=0.0, run_status=None, fin_status=None, total=100.0, unit='', sep='/', chunk_size=1.0):  
        super(ProgressBar, self).__init__()  
        self.info = "[%s] %s %.2f %s %s %.2f %s"  
        self.title = title  
        self.total = total  
        self.count = count  
        self.chunk_size = chunk_size  
        self.status = run_status or ""  
        self.fin_status = fin_status or " " * len(self.status)  
        self.unit = unit  
        self.seq = sep  
  
    def __get_info(self):  
        #[名称] 状态 进度 单位 分割线 总数 单位  
        _info = self.info % (self.title, self.status, self.count/self.chunk_size, self.unit, self.seq, self.total/self.chunk_size, self.unit)  
        return _info  
  
    def refresh(self, count = 1, status = None):  
        self.count += count  
        self.status = status or self.status  
        end_str = "\r"  
        if self.count >= self.total:  
            end_str = '\n'  
            self.status = status or self.fin_status  
        print(self.__get_info(), end=end_str, )  


if __name__ == '__main__':
    
    print('*'100 *)
     Print ( ' \ t \ t \ t \ t Welcome Download Little Helper ' )
     Print ( ' Author: muzihuaner https://www.cnblogs.com/HGNET/ ' )
     Print ( ' * ' * 100 ) 
    url   = the iNPUT ( ' Please enter a link to download the file: \ the n- ' ) 
    filename = url.split ( ' / ' ) [- 1 ] 
    with closing (requests.get (url, Stream = True)) AS the Response:   
        chunk_size = 1024   
        content_size int = (Response.Headers ['-length Content ' ])  
         IF response.status_code == 200 is :
             Print ( ' File size: KB% 0.2f ' % (content_size / chunk_size)) 
            Progress = the ProgressBar ( " % S download progress " % filename 
                        , Total = content_size   
                        , Unit = " KB "   
                        , chunk_size = chunk_size   
                        , run_status = " downloading "  
                        , fin_status = "下载完成")  

            with open(filename, "wb") as file:  
                    for data in response.iter_content(chunk_size=chunk_size):  
                        file.write(data)  
                        progress.refresh(count=len(data))  
        else:
            print('链接异常')