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Choosing from Multiple Outputs

By default, the last output of the selected cell is used as a thumbnail. If that’s what you want, you can simply use the nbsphinx-thumbnail cell tag.

If you want to specify one of multiple outputs, you can add a (zero-based) "output-index" to your "nbsphinx-thumbnail" cell metadata.

The following cell has this metadata, selecting the third output to be used as thumbnail in the gallery.

{
    "nbsphinx-thumbnail": {
        "output-index": 2
    }
}

from IPython.display import Image

display(Image(url='https://jupyter.org/assets/homepage/main-logo.svg'))
print('Hello!')
display(Image(filename='../images/notebook_icon.png'))
display(Image(url='https://www.python.org/static/img/python-logo-large.png', embed=True))

Hello!

---------------------------------------------------------------------------
gaierror                                  Traceback (most recent call last)
File /usr/lib64/python3.15/urllib/request.py:1323, in AbstractHTTPHandler.do_open(self, http_class, req, **http_conn_args)
   1322 try:
-> 1323     h.request(req.get_method(), req.selector, req.data, headers,
   1324               encode_chunked=req.has_header('Transfer-encoding'))
   1325 except OSError as err: # timeout error

File /usr/lib64/python3.15/http/client.py:1371, in HTTPConnection.request(self, method, url, body, headers, encode_chunked)
   1370 """Send a complete request to the server."""
-> 1371 self._send_request(method, url, body, headers, encode_chunked)

File /usr/lib64/python3.15/http/client.py:1417, in HTTPConnection._send_request(self, method, url, body, headers, encode_chunked)
   1416     body = _encode(body, 'body')
-> 1417 self.endheaders(body, encode_chunked=encode_chunked)

File /usr/lib64/python3.15/http/client.py:1366, in HTTPConnection.endheaders(self, message_body, encode_chunked)
   1365     raise CannotSendHeader()
-> 1366 self._send_output(message_body, encode_chunked=encode_chunked)

File /usr/lib64/python3.15/http/client.py:1126, in HTTPConnection._send_output(self, message_body, encode_chunked)
   1125 del self._buffer[:]
-> 1126 self.send(msg)
   1128 if message_body is not None:
   1129
   1130     # create a consistent interface to message_body

File /usr/lib64/python3.15/http/client.py:1070, in HTTPConnection.send(self, data)
   1069 if self.auto_open:
-> 1070     self.connect()
   1071 else:

File /usr/lib64/python3.15/http/client.py:1509, in HTTPSConnection.connect(self)
   1507 "Connect to a host on a given (SSL) port."
-> 1509 super().connect()
   1511 if self._tunnel_host:

File /usr/lib64/python3.15/http/client.py:1036, in HTTPConnection.connect(self)
   1035 sys.audit("http.client.connect", self, self.host, self.port)
-> 1036 self.sock = self._create_connection(
   1037     (self.host,self.port), self.timeout, self.source_address)
   1038 # Might fail in OSs that don't implement TCP_NODELAY

File /usr/lib64/python3.15/socket.py:859, in create_connection(address, timeout, source_address, all_errors)
    858 exceptions = []
--> 859 for res in getaddrinfo(host, port, 0, SOCK_STREAM):
    860     af, socktype, proto, canonname, sa = res

File /usr/lib64/python3.15/socket.py:996, in getaddrinfo(host, port, family, type, proto, flags)
    995 addrlist = []
--> 996 for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
    997     af, socktype, proto, canonname, sa = res

gaierror: [Errno -3] Temporary failure in name resolution

During handling of the above exception, another exception occurred:

URLError                                  Traceback (most recent call last)
Cell In[1], line 6
      2
      3 display(Image(url='https://jupyter.org/assets/homepage/main-logo.svg'))
      4 print('Hello!')
      5 display(Image(filename='../images/notebook_icon.png'))
----> 6 display(Image(url='https://www.python.org/static/img/python-logo-large.png', embed=True))

File /usr/lib64/python3.15/urllib/request.py:187, in urlopen(url, data, timeout, context)
    185 else:
    186     opener = _opener
--> 187 return opener.open(url, data, timeout)

File /usr/lib64/python3.15/urllib/request.py:489, in OpenerDirector.open(self, fullurl, data, timeout)
    486     req = meth(req)
    488 sys.audit('urllib.Request', req.full_url, req.data, req.headers, req.get_method())
--> 489 response = self._open(req, data)
    491 # post-process response
    492 meth_name = protocol+"_response"

File /usr/lib64/python3.15/urllib/request.py:506, in OpenerDirector._open(self, req, data)
    503     return result
    505 protocol = req.type
--> 506 result = self._call_chain(self.handle_open, protocol, protocol +
    507                           '_open', req)
    508 if result:
    509     return result

File /usr/lib64/python3.15/urllib/request.py:466, in OpenerDirector._call_chain(self, chain, kind, meth_name, *args)
    464 for handler in handlers:
    465     func = getattr(handler, meth_name)
--> 466     result = func(*args)
    467     if result is not None:
    468         return result

File /usr/lib64/python3.15/urllib/request.py:1371, in HTTPSHandler.https_open(self, req)
   1370 def https_open(self, req):
-> 1371     return self.do_open(http.client.HTTPSConnection, req,
   1372                         context=self._context)

File /usr/lib64/python3.15/urllib/request.py:1326, in AbstractHTTPHandler.do_open(self, http_class, req, **http_conn_args)
   1323         h.request(req.get_method(), req.selector, req.data, headers,
   1324                   encode_chunked=req.has_header('Transfer-encoding'))
   1325     except OSError as err: # timeout error
-> 1326         raise URLError(err)
   1327     r = h.getresponse()
   1328 except:

URLError: <urlopen error [Errno -3] Temporary failure in name resolution>