klappnase added the comment:
Your changed _configure() will also break Canvas/Listbox.itemconfigure(),
Menu.entryconfigure() and a number of other methods, Tix is also affected. It
will also break third party extensions that use _configure(), like pybwidget.
As another python motto says "Special cases aren't special enough to break the
rules." :) I believe that breaking existing code is not justified by the
"special case" of the tk_busy_configure() syntax, resp. the desire to avoid 10
extra lines of code.
The change to _configure() I suggested otoh leaves all the existing
configure()-like methods intact, and it seems at least very unlikely that some
third party module uses a configure()-like method that adds the window path
name to the cmd-tuple (which indeed would break my _configure() example.
However, following the "explicit is better than implicit" motto, I believe the
best idea, if _configure() should be changed at all, is to add a new option to
let the programmer decide if the window path should be added to the cmd tuple,
which defaults to a value that keeps the old behavior intact, as in this
example:
def _configure(self, cmd, cnf, kw, usewinpath=True):
"""Internal function."""
if kw:
cnf = _cnfmerge((cnf, kw))
elif cnf:
cnf = _cnfmerge(cnf)
if usewinpath:
cmd = _flatten((self._w, cmd))
else:
cmd = _flatten(cmd)
if cnf is None:
return self._getconfigure(cmd)
if isinstance(cnf, str):
return self._getconfigure1(cmd + ('-'+cnf,))
self.tk.call(cmd + self._options(cnf))
Then busy_configure might look like:
def busy_configure(self, cnf=None, **kw):
return self._configure(('tk', 'busy', 'configure', self._w),
cnf, kw, usewinpath=False)
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<http://bugs.python.org/issue28498>
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