/usr/share/pyshared/tvtk/pyface/toolkit.py is in mayavi2 4.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
#------------------------------------------------------------------------------
# Standard library imports.
import sys
# Enthought library imports.
from traits.etsconfig.api import ETSConfig
# This is set to the toolkit selection.
_toolkit = None
def _init_toolkit():
""" Initialise the current toolkit. """
def import_toolkit(tk):
try:
# Try and import the toolkit's pyface backend init module.
__import__('tvtk.pyface.ui.%s.init' % tk)
except:
raise
if ETSConfig.toolkit:
# If the toolkit has been explicitly specified, just import it and
# allow failure if an exception is thrown.
import_toolkit(ETSConfig.toolkit)
tk = ETSConfig.toolkit
else:
# Toolkits to check for if none is explicitly specified.
known_toolkits = ('wx', 'qt4', 'null')
for tk in known_toolkits:
try:
import_toolkit(tk)
# In case we have just decided on a toolkit, tell everybody else.
ETSConfig.toolkit = tk
break
except ImportError:
pass
else:
# Try to import the null toolkit but don't set the ETSConfig toolkit
try:
tk = 'null'
import_toolkit(tk)
import warnings
warnings.warn("Unable to import the %s backend for pyface;"\
" using the 'null' toolkit instead." % ", ".join(toolkits))
except:
raise ImportError("unable to import a pyface backend for any of the %s toolkits" \
% ", ".join(known_toolkits))
# Save the imported toolkit name.
global _toolkit
_toolkit = tk
# Do this once then disappear.
_init_toolkit()
del _init_toolkit
def toolkit_object(name):
""" Return the toolkit specific object with the given name. The name
consists of the relative module path and the object name separated by a
colon.
"""
mname, oname = name.split(':')
be = 'tvtk.pyface.ui.%s.' % _toolkit
be_mname = be + mname
class Unimplemented(object):
""" This is returned if an object isn't implemented by the selected
toolkit. It raises an exception if it is ever instantiated.
"""
def __init__(self, *args, **kwargs):
raise NotImplementedError("the %s pyface backend doesn't implement %s" % (be, oname))
be_obj = Unimplemented
try:
__import__(be_mname)
try:
be_obj = getattr(sys.modules[be_mname], oname)
except AttributeError:
pass
except ImportError:
pass
return be_obj
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