Bugs item #1160383, was opened at 2005-03-09 20:32
Message generated for change (Comment added) made by isandler
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Category: Tkinter
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Ilya Sandler (isandler)
Assigned to: Martin v. Löwis (loewis)
Summary: digit-only tag values are mishandled in Tkinter
Initial Comment:
It appears that most Tkinter tag operations fail on
digit-only tag values
>>> from Tkinter import *
>>> root=Tk()
>>> c=Canvas(root)
>>> c.create_line(0,0,100,100, tags="123")
1
>>> c.gettags(1)
('123',)
>>> c.pack()
>>> c.find_withtag("123")
()
tkinter docs:
http://www.pythonware.com/library/tkinter/introduction/x2017-concepts.htm
only say this about tag values:
"Tags are ordinary strings, and they can contain
anything except whitespace."
So this behaviour seems like a bug.
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>Comment By: Ilya Sandler (isandler)
Date: 2005-03-19 22:33
Message:
Logged In: YES
user_id=971153
>".. Item handles can be passed to the various canvas methods
> either as integers or as strings..." (from effbot posting)
While I can see how a very careful reader might notice that
there is a potential conflict between this "handles as
strings" statement and "tags can contain anything", I still
think that at the very least this conflict needs to be
mentioned explicitly.
> Furthermore, the site www.pythonware.com is a third-party
> site not run by the Python developers (from jepler posting)
Actually for whatever reason I thought that pythonware.com
is the authorative source for tkinter docs....
I guess it does bring an interesting question for Fredrik...
Would you consider merging your Tkinter docs (which seem to
be reasonably complete) with python.org docs which seem to
be very spotty?
----------------------------------------------------------------------
Comment By: Fredrik Lundh (effbot)
Date: 2005-03-19 08:53
Message:
Logged In: YES
user_id=38376
Here's the text before the quoted line:
"Everywhere a method expects an item specifier, you can
use one of the following: * item handles * tags /.../ Item
handles are integer values that are used to identify a specific
item on the canvas /.../ Item handles can be passed to the
various canvas methods either as integers or as strings. /.../"
Note the use of "one of", and the fact that item handles are
described before tags. (Writing documentation for people who
only reads random sentences is pretty much impossible...)
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Comment By: Jeff Epler (jepler)
Date: 2005-03-19 06:20
Message:
Logged In: YES
user_id=2772
This is a documentation bug. The Tk documentation says
(canvas, section "ITEM IDS AND TAGS"):
Each item may also have any number of tags
associated with it. A tag
is just a string of characters, and it may take any
form except that
of an integer. For example, ‘‘x123’’ is OK but
‘‘123’’ isn’t. The
same tag may be associated with many different items.
Furthermore, the site www.pythonware.com is a third-party
site not run by the Python developers. The official Python
documentation
(http://docs.python.org/lib/module-Tkinter.html and 'pydoc
Tkinter') doesn't explain the syntax of an item tag anywhere
that I could see)
I recommend closing this bug and notifying pythonware.com /
Fredrik Lundh about the problem via e-mail.
----------------------------------------------------------------------
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