title: yahoo-finance python library not working?
body: <p>today I'm try to use yahoo-finance library than some issue occur by code.
  i provide code and occurred error. 
  here is library link <a href="https://pypi.org/project/yahoo-finance/" rel="nofollow noreferrer">https://pypi.org/project/yahoo-finance/</a></p>
  
  <p>code:-</p>
  
  <pre class="lang-py prettyprint-override"><code>from yahoo_finance import Share
  yahoo = Share('YHOO')
  print(yahoo.get_open())
  </code></pre>
  
  <p>Error is</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/lib/python3.6/urllib/request.py", line 1318, in do_open
      encode_chunked=req.has_header('Transfer-encoding'))
    File "/usr/lib/python3.6/http/client.py", line 1254, in request
      self._send_request(method, url, body, headers, encode_chunked)
    File "/usr/lib/python3.6/http/client.py", line 1300, in _send_request
      self.endheaders(body, encode_chunked=encode_chunked)
    File "/usr/lib/python3.6/http/client.py", line 1249, in endheaders
      self._send_output(message_body, encode_chunked=encode_chunked)
    File "/usr/lib/python3.6/http/client.py", line 1036, in _send_output
      self.send(msg)
    File "/usr/lib/python3.6/http/client.py", line 974, in send
      self.connect()
    File "/usr/lib/python3.6/http/client.py", line 1407, in connect
      super().connect()
    File "/usr/lib/python3.6/http/client.py", line 946, in connect
      (self.host,self.port), self.timeout, self.source_address)
    File "/usr/lib/python3.6/socket.py", line 704, in create_connection
      for res in getaddrinfo(host, port, 0, SOCK_STREAM):
    File "/usr/lib/python3.6/socket.py", line 745, in getaddrinfo
      for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
  socket.gaierror: [Errno -2] Name or service not known
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "main.py", line 3, in &lt;module&gt;
      yahoo = Share('YHOO')
    File "/home/yogesh/.local/lib/python3.6/site-packages/yahoo_finance/__init__.py", line 178, in __init__
      self.refresh()
    File "/home/yogesh/.local/lib/python3.6/site-packages/yahoo_finance/__init__.py", line 142, in refresh
      self.data_set = self._fetch()
    File "/home/yogesh/.local/lib/python3.6/site-packages/yahoo_finance/__init__.py", line 181, in _fetch
      data = super(Share, self)._fetch()
    File "/home/yogesh/.local/lib/python3.6/site-packages/yahoo_finance/__init__.py", line 134, in _fetch
      data = self._request(query)
    File "/home/yogesh/.local/lib/python3.6/site-packages/yahoo_finance/__init__.py", line 118, in _request
      response = yql.YQLQuery().execute(query)
    File "/home/yogesh/.local/lib/python3.6/site-packages/yahoo_finance/yql.py", line 61, in execute
      'env': DATATABLES_URL
    File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
      return opener.open(url, data, timeout)
    File "/usr/lib/python3.6/urllib/request.py", line 526, in open
      response = self._open(req, data)
    File "/usr/lib/python3.6/urllib/request.py", line 544, in _open
      '_open', req)
    File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
      result = func(*args)
    File "/usr/lib/python3.6/urllib/request.py", line 1361, in https_open
      context=self._context, check_hostname=self._check_hostname)
    File "/usr/lib/python3.6/urllib/request.py", line 1320, in do_open
      raise URLError(err)
  urllib.error.URLError: &lt;urlopen error [Errno -2] Name or service not known&gt;
  </code></pre>
  
  <p>i have a no idea about this error, please help me to solve this problem. Thank you....</p>