pythonコードによるファイルダウンロード機能の実現

#!/usr/bin/env python3

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.statue)
        self.unit = unit
        self.seq = sep

    def __get_info(self):
        # 【  】                  
        _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
        # if status is not None:
        self.status = status or self.status
        end_str = "\r"
        if self.count >= self.total:
            end_str = '
'
            self.status = status or self.fin_status
        print(self.__get_info(), end=end_str)

def main():
    #        
    with closing(requests.get("https://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-5.6.40-winx64.zip", stream=True)) as response:
        chunk_size = 1024
        content_size = int(response.headers['content-length'])
        progress = ProgressBar("razorback", total=content_size, unit="KB", chunk_size=chunk_size, run_status="    ", fin_status="    ")
        # chunk_size = chunk_size < content_size and chunk_size or content_size
        #              
        with open('./mysql.zip', "wb") as file:
            for data in response.iter_content(chunk_size=chunk_size):
                file.write(data)
                progress.refresh(count=len(data))

if __name__ == '__main__':
    main()