Python3使用requests模块实现显示下载进度的方法详解

tarball_url = 'https://github.com/kennethreitz/requests/tarball/master'
r = requests.get(tarball_url, stream=True)

if int(r.headers['content-length']) < TOO_LONG:
 content = r.content
 ...

from contextlib import closing
with closing(requests.get('http://httpbin.org/get', stream=True)) as r:
  # Do things with the response here.

with closing(requests.get(self.url(), stream=True)) as response:
  chunk_size = 1024 # 单次请求最大值
  content_size = int(response.headers['content-length']) # 内容体总大小
  progress = ProgressBar(self.file_name(), total=content_size,
                   unit="KB", chunk_size=chunk_size, run_status="正在下载", fin_status="下载完成")
  with open(file_name, "wb") as file:
    for data in response.iter_content(chunk_size=chunk_size):
      file.write(data)
      progress.refresh(count=len(data))

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
    # if status is not None:
    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)