downloader.py

#-*- coding: UTF-8 -*-
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__':
	#url = 'http://www.demongan.com/source/game/二十四点.zip'
	#filename = '二十四点.zip'
	print('*' * 100)
	print('\t\t\t\t欢迎使用文件下载小助手')
	print('作者:Jack-Cui\n博客:http://blog.csdn.net/c406495762')
	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')