【Python】文件下载小助手

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 = "
"  
        if self.count >= self.total:  
            end_str = '
'  
            self.status = status or self.fin_status  
        print(self.__get_info(), end=end_str, )  


if __name__ == '__main__':
    
    print('*' * 100)
    print('				欢迎使用文件下载小助手')
    print('作者:muzihuaner https://www.cnblogs.com/HGNET/')
    print('*' * 100)
    url  = input('请输入需要下载的文件链接:
')
    filename = url.split('/')[-1]
    with closing(requests.get(url, stream=True)) as response:  
        chunk_size = 1024  
        content_size = int(response.headers['content-length'])  
        if response.status_code == 200:
            print('文件大小:%0.2f KB' % (content_size / chunk_size))
            progress = ProgressBar("%s下载进度" % filename
                        , total = content_size  
                        , unit = "KB"  
                        , chunk_size = chunk_size  
                        , run_status = "正在下载"  
                        , 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')