retry when connection error happened

[yanxurui]

Traceback (most recent call last):
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 670, in urlopen
    httplib_response = self._make_request(
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 426, in _make_request
    six.raise_from(e, None)
  File "<string>", line 3, in raise_from
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 421, in _make_request
    httplib_response = conn.getresponse()
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/http/client.py", line 1322, in getresponse
    response.begin()
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/http/client.py", line 303, in begin
    version, status, reason = self._read_status()
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/http/client.py", line 264, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/socket.py", line 669, in readinto
    return self._sock.recv_into(b)
ConnectionResetError: [Errno 104] Connection reset by peer

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/requests/adapters.py", line 439, in send
    resp = conn.urlopen(
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 726, in urlopen
    retries = retries.increment(
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/util/retry.py", line 410, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/packages/six.py", line 734, in reraise
    raise value.with_traceback(tb)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 670, in urlopen
    httplib_response = self._make_request(
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 426, in _make_request
    six.raise_from(e, None)
  File "<string>", line 3, in raise_from
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/urllib3/connectionpool.py", line 421, in _make_request
    httplib_response = conn.getresponse()
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/http/client.py", line 1322, in getresponse
    response.begin()
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/http/client.py", line 303, in begin
    version, status, reason = self._read_status()
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/http/client.py", line 264, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/home/yxr/.pyenv/versions/3.8.1/lib/python3.8/socket.py", line 669, in readinto
    return self._sock.recv_into(b)
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "fund.py", line 102, in main
    fund = Fund(fund_code)
  File "fund.py", line 30, in __init__
    self.name, self.worth = self.download(fund_code)
  File "fund.py", line 40, in download
    r = requests.get(url)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/requests/sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/requests/sessions.py", line 643, in send
    r = adapter.send(request, **kwargs)
  File "/home/yxr/.pyenv/versions/invest/lib/python3.8/site-packages/requests/adapters.py", line 498, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))