[IPython-dev] Proposal for small change in dir2() function to handle XMLRPC Server Proxies
Marco Nawijn
nawijn at gmail.com
Thu Oct 11 10:03:25 EDT 2012
Dear All,
I would to propose that a small change is made to the dir2() function
in IPython to better handle tab completion on a xmlrpclib.ServerProxy
object.
Currently if you do tab completion on a xmlrpclib.ServerProxy it a
traceback like the following is generated:
=== BEGIN TRACEBACK =====
Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/IPython/core/completer.py",
line 847, in complete
self.matches.extend(matcher(text))
File "/usr/lib/python2.7/site-packages/IPython/core/completer.py",
line 641, in python_matches
matches = self.attr_matches(text)
File "/usr/lib/python2.7/site-packages/IPython/core/completer.py",
line 393, in attr_matches
words = dir2(obj)
File "/usr/lib/python2.7/site-packages/IPython/utils/dir2.py", line
64, in dir2
words.extend(obj.trait_names())
File "/usr/lib64/python2.7/xmlrpclib.py", line 1224, in __call__
return self.__send(self.__name, args)
File "/usr/lib64/python2.7/xmlrpclib.py", line 1578, in __request
verbose=self.__verbose
File "/usr/lib64/python2.7/xmlrpclib.py", line 1264, in request
return self.single_request(host, handler, request_body, verbose)
File "/usr/lib64/python2.7/xmlrpclib.py", line 1297, in single_request
return self.parse_response(response)
File "/usr/lib64/python2.7/xmlrpclib.py", line 1473, in parse_response
return u.close()
File "/usr/lib64/python2.7/xmlrpclib.py", line 793, in close
raise Fault(**self._stack[0])
Fault: <Fault 1: '<type \'exceptions.Exception\'>:method "trait_names"
is not supported'>
If you suspect this is an IPython bug, please report it at:
https://github.com/ipython/ipython/issues
or send an email to the mailing list at ipython-dev at scipy.org
You can print a more detailed traceback right now with "%tb", or use "%debug"
to interactively debug it.
Extra-detailed tracebacks for bug-reporting purposes can be enabled via:
%config Application.verbose_crash=True
===== END TRACEBACK ======
The source of this as can be seen from the traceback is in the dir2() function.
Since the main purpose of dir2 seems to be to handle border cases, I
would like to propose that an additional case is implemented to handle
xmlrpclib.ServerProxy objects.
I have implemented it (as a proof of concept) as follows:
import xmlrpclib
if isinstance(obj, xmlrpclib.ServerProxy):
words = obj.system.listMethods()
return words
else:
words = dir(obj) <- this is already there
It works like a charm :).
Any comments on this?
Kind regards,
Marco Nawijn
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