【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 = "\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:\n')
    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')