/Users/chenwang/PycharmProjects/TestAppium/venv/bin/python /Users/chenwang/PycharmProjects/TestAppium/test_demo.py
Traceback (most recent call last):
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connection.py", line 160, in _new_conn
    (self._dns_host, self.port), self.timeout, **extra_kw
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/util/connection.py", line 84, in create_connection
    raise err
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/util/connection.py", line 74, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 677, in urlopen
    chunked=chunked,
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 392, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connection.py", line 187, in connect
    conn = self._new_conn()
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connection.py", line 172, in _new_conn
    self, "Failed to establish a new connection: %s" % e
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x1102eafd0>: Failed to establish a new connection: [Errno 61] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/chenwang/PycharmProjects/TestAppium/test_demo.py", line 8, in <module>
    driver=webdriver.Remote('http://localhost:4723/wd/hub',desired_caps)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/appium/webdriver/webdriver.py", line 155, in __init__
    proxy
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 157, in __init__
    self.start_session(capabilities, browser_profile)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/appium/webdriver/webdriver.py", line 225, in start_session
    response = self.execute(RemoteCommand.NEW_SESSION, parameters)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 319, in execute
    response = self.command_executor.execute(driver_command, params)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/selenium/webdriver/remote/remote_connection.py", line 374, in execute
    return self._request(command_info[0], url, body=data)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/selenium/webdriver/remote/remote_connection.py", line 397, in _request
    resp = self._conn.request(method, url, body=body, headers=headers)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/request.py", line 80, in request
    method, url, fields=fields, headers=headers, **urlopen_kw
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/request.py", line 171, in request_encode_body
    return self.urlopen(method, url, **extra_kw)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/poolmanager.py", line 336, in urlopen
    response = conn.urlopen(method, u.request_uri, **kw)
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 765, in urlopen
    **response_kw
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 765, in urlopen
    **response_kw
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 765, in urlopen
    **response_kw
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/connectionpool.py", line 725, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/Users/chenwang/PycharmProjects/TestAppium/venv/lib/python3.6/site-packages/urllib3/util/retry.py", line 439, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=4723): Max retries exceeded with url: /wd/hub/session (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x1102eafd0>: Failed to establish a new connection: [Errno 61] Connection refused',))

Process finished with exit code 1