Tab-completion in IPython Breaks Terminal.app

I’ve got a compileable macro library that I can load in ROOT by doing “.L t2x.C+”, and I can access it in a PyROOT script using ROOT.gROOT.ProcessLine(".L t2x.C+"); ROOT.t2x.foo.

I just noticed however that if I try to tab-complete ROOT.t2x to see what classes, functions, and variables are available, I get a massive crash of ROOT and the Python interpreter. Even my Terminal.app (on Mac OSX 10.9) ends up semi-broken, where pressing enter no longer adds a newline and commands typed in don’t appear on the command line.

Here’s the crash printout:

jfcaron@dhcp-128-189-75-219:~/Projects/Proto2BeamTest2$ ipython
import Python 2.7.6 (default, Nov 19 2013, 19:15:05) 
Type "copyright", "credits" or "license" for more information.

IPython 2.0.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: import ROOT

In [2]: ROOT.gROOT.ProcessLine(".L t2x.C+")
Out[2]: 0L

In [3]: ROOT.t2x.
 *** Break *** segmentation violation
 Generating stack trace...
 0x000000010db580cf in PyROOT::(anonymous namespace)::pp_get(PyROOT::PropertyProxy*, PyROOT::ObjectProxy*, _object*) (in libPyROOT.so) + 79
 0x000000010db5ae37 in PyROOT::(anonymous namespace)::pt_getattro(_object*, _object*) (in libPyROOT.so) + 39
 0x000000010c8ecc98 in builtin_hasattr (in Python) + 136
 0x000000010c8f2010 in PyEval_EvalFrameEx (in Python) + 7712
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8830c6 in function_call (in Python) + 342
 0x000000010c85f665 in PyObject_Call (in Python) + 101
 0x000000010c86b7b6 in instancemethod_call (in Python) + 182
 0x000000010c85f665 in PyObject_Call (in Python) + 101
 0x000000010c8f40b4 in PyEval_EvalFrameEx (in Python) + 16068
 0x000000010c8f6ed2 in fast_function (in Python) + 194
 0x000000010c8f328b in PyEval_EvalFrameEx (in Python) + 12443
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8830c6 in function_call (in Python) + 342
 0x000000010c85f665 in PyObject_Call (in Python) + 101
 0x000000010c86b7b6 in instancemethod_call (in Python) + 182
 0x000000010c85f665 in PyObject_Call (in Python) + 101
 0x000000010c85f7f3 in PyObject_CallFunction (in Python) + 291
 0x000000010da767a2 in on_completion (in readline.so) + 82
 0x000000010da83743 in rl_completion_matches (in readline.so) + 99
 0x000000010da82a6b in gen_completion_matches (in readline.so) + 123
 0x000000010da808d7 in rl_complete_internal (in readline.so) + 327
 0x000000010da80743 in rl_complete (in readline.so) + 147
 0x000000010da780e2 in _rl_dispatch_subseq (in readline.so) + 530
 0x000000010da77b6e in _rl_dispatch (in readline.so) + 46
 0x000000010da77acb in readline_internal_char (in readline.so) + 443
 0x000000010da99294 in rl_callback_read_char (in readline.so) + 1028
 0x000000010da76511 in call_readline (in readline.so) + 369
 0x000000010c856c03 in PyOS_Readline (in Python) + 179
 0x000000010c8ee002 in builtin_raw_input (in Python) + 434
 0x000000010c8f2010 in PyEval_EvalFrameEx (in Python) + 7712
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8f6f36 in fast_function (in Python) + 294
 0x000000010c8f328b in PyEval_EvalFrameEx (in Python) + 12443
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8f6f36 in fast_function (in Python) + 294
 0x000000010c8f328b in PyEval_EvalFrameEx (in Python) + 12443
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8f6f36 in fast_function (in Python) + 294
 0x000000010c8f328b in PyEval_EvalFrameEx (in Python) + 12443
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8f6f36 in fast_function (in Python) + 294
 0x000000010c8f328b in PyEval_EvalFrameEx (in Python) + 12443
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8830c6 in function_call (in Python) + 342
 0x000000010c85f665 in PyObject_Call (in Python) + 101
 0x000000010c8f44e6 in PyEval_EvalFrameEx (in Python) + 17142
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8f6f36 in fast_function (in Python) + 294
 0x000000010c8f328b in PyEval_EvalFrameEx (in Python) + 12443
 0x000000010c8f0076 in PyEval_EvalCodeEx (in Python) + 1734
 0x000000010c8ef9a6 in PyEval_EvalCode (in Python) + 54
 0x000000010c917611 in PyRun_FileExFlags (in Python) + 161
 0x000000010c91715e in PyRun_SimpleFileExFlags (in Python) + 718
 0x000000010c92b002 in Py_Main (in Python) + 3314
 0x00007fff967f85fd in start (in libdyld.dylib) + 1
jfcaron@dhcp-128-189-75-219:~/Projects/Proto2BeamTest2$ jfcaron@dhcp-128-189-75-219:~/Projects/Proto2BeamTest2$ 

and the t2x.C file in question (along with other dependent files) live here: http://bazaar.launchpad.net/~jfcaron/+junk/Proto2BeamTest2/view/head:/t2x.C

I’m ok with tab-completion not working, because I know PyROOT does this lazy-loading thing, but it probably shouldn’t crash this hard.

Jean-François

Jean-François,

agree, and will have a look once I’m behind a Mac …

Just to note that the prompt, after the crash, can usually be normalized with “stty sane” (type blind if need be and use “^j” if “enter” does respond).

Cheers,
Wim

Jean-François,

the problem is with:const TString SideStrings[] = {"LEFT","RIGHT","BOTH"};which wasn’t supported. I’ve changed the code to return the first element, which isn’t correct, but it’s way better than crashing. :slight_smile:

In ROOT6 you’ll have access to the full array. That is:[code]>>> # in ROOT5 …

ROOT.t2x.SideStrings
’LEFT’

whereas in ROOT6 …

print ROOT.t2x.SideStrings
(‘LEFT’, ‘RIGHT’, ‘BOTH’)[/code]
Cheers,
Wim