Bugs item #615772, was opened at 2002-09-28 07:27
Message generated for change (Comment added) made by tzot
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Category: Tkinter
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Samuel Bronson (sbronson)
Assigned to: Nobody/Anonymous (nobody)
Summary: Tkinter.Misc has no __contains__ method
Initial Comment:
This can lead to a lot of confusion.
If I do `"spam" in widget', I get a TypeError.
Case in point: (the code in question is probably
incorrect, so I am not including it)
/usr/tmp/python-14024DA
45 self.pack()
46
47 if __name__ == '__main__':
48 widget = TkLife(None, height=20, width=20)
49 widget.loop()
widget undefined
TkLife = <class __main__.TkLife>
None undefined
height undefined
width undefined
/usr/tmp/python-14024DA in
__init__(self=<__main__.TkLife instance>, master=None,
**kw={'height': 20, 'width': 20})
27 self['state'] = Tkinter.DISABLED
28
29 if 'cells' not in self:
30 assert 'width' in self and 'height'
in self
31 self['cells'] =
randomcells(self['width'], self['height'])
self = <__main__.TkLife instance>
/usr/local/lib/python2.2/lib-tk/Tkinter.py in
cget(self=<__main__.TkLife instance>, key=0)
1088 def cget(self, key):
1089 """Return the resource value for a KEY
given as string."""
1090 return self.tk.call(self._w, 'cget', '-'
+ key)
1091 __getitem__ = cget
1092 def __setitem__(self, key, value):
self = <__main__.TkLife instance>
self.tk = <tkapp object>
self.tk.call = <built-in method call of tkapp object>
self._w = '.135644212'
key = 0
TypeError: cannot concatenate 'str' and 'int' objects
__doc__ =
'Inappropriate argument type.'
__getitem__ =
<bound method TypeError.__getitem__ of
<exceptions.TypeError instance at 0x83202cc>>
__init__ =
<bound method TypeError.__init__ of
<exceptions.TypeError instance at 0x83202cc>>
__module__ =
'exceptions'
__str__ =
<bound method TypeError.__str__ of
<exceptions.TypeError instance at 0x83202cc>>
args =
("cannot concatenate 'str' and 'int' objects",)
The above is a description of an error in a Python
program. Here is
the original traceback:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/tmp/python-14024DA", line 48, in ?
widget = TkLife(None, height=20, width=20)
File "/usr/tmp/python-14024DA", line 29, in __init__
if 'cells' not in self:
File "/usr/local/lib/python2.2/lib-tk/Tkinter.py",
line 1090, in cget
return self.tk.call(self._w, 'cget', '-' + key)
TypeError: cannot concatenate 'str' and 'int' objects
----------------------------------------------------------------------
Comment By: Christos Georgiou (tzot)
Date: 2006-03-31 20:00
Message:
Logged In: YES
user_id=539787
The __setitem__ and __getitem__ methods are there only as a
convenience, not to emulate dictionaries. The TclError
returned ("unknown option...") is clear enough to be handled
in an except clause.
I vote -0 for inclusion of such functionality (`option in
widget`) for LBYL code.
----------------------------------------------------------------------
Comment By: Jeff Epler (jepler)
Date: 2002-09-29 16:52
Message:
Logged In: YES
user_id=2772
This patch makes Tkinter widgets more "dict-like". I don't
know if this is really desirable, I've never configured
widgets through the __setitem__ interface.
* __getitem__ raises KeyError when cget() raises TclError
* __setitem__ raises KeyError when configure() raises TclError
* implemented has_key(), __contains__(), values(), items()
Uh, I'm obviously blind here, because I don't see the
"attach file" section of the tracker. Sorry, but I'll have
to inline the patch. I'll also place it at
http://unpythonic.net/~jepler/tkinter-dictlike.diff
--- Tkinter.py.ori Sun Sep 29 08:30:58 2002
+++ Tkinter.py Sun Sep 29 08:46:20 2002
@@ -1096,13 +1096,27 @@
def cget(self, key):
"""Return the resource value for a KEY given as
string."""
return self.tk.call(self._w, 'cget', '-' + key)
- __getitem__ = cget
+ def __getitem__(self, key):
+ try:
+ return self.cget(key)
+ except TclError:
+ raise KeyError, key
def __setitem__(self, key, value):
- self.configure({key: value})
+ try:
+ self.configure({key: value})
+ except TclError:
+ raise KeyError, key
+ def has_key(self, key):
+ return key in self.keys()
+ __contains__ = has_key
def keys(self):
"""Return a list of all resource names of this
widget."""
return map(lambda x: x[0][1:],
self.tk.split(self.tk.call(self._w,
'configure')))
+ def values(self):
+ return [self[k] for k in self.keys()]
+ def items(self):
+ return [(k, self[k]) for k in self.keys()]
def __str__(self):
"""Return the window path name of this
widget."""
return self._w
----------------------------------------------------------------------
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