Unable to connect to tableau server 10.5 using TableauServerClient python library

I have used following python code to connect to Tableau server :

import tableauserverclient as TSC

tableau_auth = TSC.TableauAuth('username', 'password')

server = TSC.Server('https://server_name.com/')

server.auth.sign_in(tableau_auth)

But I am getting following error:

Traceback (most recent call last):

File "C:Program FilesAnaconda3libsite-packagesurllib3contribpyopenssl.py", line 444, in wrap_socket
cnx.do_handshake()

File "C:Program FilesAnaconda3libsite-packagesOpenSSLSSL.py", line 1443, in do_handshake
self._raise_ssl_error(self._ssl, result)

File "C:Program FilesAnaconda3libsite-packagesOpenSSLSSL.py", line 1191, in _raise_ssl_error
_raise_current_error()

File "C:Program FilesAnaconda3libsite-packagesOpenSSL_util.py", line 48, in exception_from_error_queue
raise exception_type(errors)
OpenSSL.SSL.Error: [('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "C:Program FilesAnaconda3libsite-packagesurllib3connectionpool.py", line 600, in urlopen
chunked=chunked)

File "C:Program FilesAnaconda3libsite-packagesurllib3connectionpool.py", line 343, in _make_request
self._validate_conn(conn)

File "C:Program FilesAnaconda3libsite-packagesurllib3connectionpool.py", line 849, in _validate_conn
conn.connect()

File "C:Program FilesAnaconda3libsite-packagesurllib3connection.py", line 356, in connect
ssl_context=context)

File "C:Program FilesAnaconda3libsite-packagesurllib3utilssl_.py", line 359, in ssl_wrap_socket
return context.wrap_socket(sock, server_hostname=server_hostname)

File "C:Program FilesAnaconda3libsite-packagesurllib3contribpyopenssl.py", line 450, in wrap_socket
raise ssl.SSLError('bad handshake: %r' % e)
ssl.SSLError: ("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "C:Program FilesAnaconda3libsite-packagesrequestsadapters.py", line 445, in send
timeout=timeout

File "C:Program FilesAnaconda3libsite-packagesurllib3connectionpool.py", line 638, in urlopen
_stacktrace=sys.exc_info()[2])

File "C:Program FilesAnaconda3libsite-packagesurllib3utilretry.py", line 398, in increment
raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='server_name.com', port=443): Max retries exceeded with url: //api/2.3/auth/signin (Caused by SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "", line 1, in

File "C:Program FilesAnaconda3libsite-packagestableauserverclientserverendpointendpoint.py", line 114, in wrapper
return func(self, *args, **kwargs)

File "C:Program FilesAnaconda3libsite-packagestableauserverclientserverendpointauth_endpoint.py", line 30, in sign_in
**self.parent_srv.http_options)

File "C:Program FilesAnaconda3libsite-packagesrequestssessions.py", line 559, in post
return self.request('POST', url, data=data, json=json, **kwargs)

File "C:Program FilesAnaconda3libsite-packagesrequestssessions.py", line 512, in request
resp = self.send(prep, **send_kwargs)

File "C:Program FilesAnaconda3libsite-packagesrequestssessions.py", line 622, in send
r = adapter.send(request, **kwargs)

File "C:Program FilesAnaconda3libsite-packagesrequestsadapters.py", line 511, in send
raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='server_name.com', port=443): Max retries exceeded with url: //api/2.3/auth/signin (Caused by SSLError(SSLError("bad handshake: Error([('SSL routines', 'ssl3_get_server_certificate', 'certificate verify failed')],)",),))

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