def get_external_tool(self, tool):
from canvasapi.external_tool import ExternalTool<EOL>tool_id = obj_or_id(tool, "<STR_LIT>", (ExternalTool,))<EOL>response = self._requester.request(<EOL>'<STR_LIT:GET>',<EOL>'<STR_LIT>'.format(self.id, tool_id),<EOL>)<EOL>tool_json = response.json()<EOL>tool_json.update({'<STR_LIT>': self.id})<EOL>return ExternalTool(self._requester, tool_json)<EOL>
:calls: `GET /api/v1/accounts/:account_id/external_tools/:external_tool_id \
<https://canvas.instructure.com/doc/api/external_tools.html#method.external_tools.show>`_

:param tool: The object or ID of the tool
:type tool: :class:`canvasapi.external_tool.ExternalTool` or int

:rtype: :class:`canvasapi.external_tool.ExternalTool`