Re: cut & paste text between tkinter widgets
Christopher Subich wrote:
> In experimenting with this, I found a slight... fun issue involved in
> this. Selection_get is the correct method to call, but it doesn't quite
> work out of the box.
> >>> g.selection_get()
> Traceback (most recent call last):
>File "", line 1, in ?
>File "C:\Python24\Lib\lib-tk\Tkinter.py", line 574, in selection_get
> return self.tk.call(('selection', 'get') + self._options(kw))
> _tkinter.TclError: PRIMARY selection doesn't exist or form "STRING" not
> defined
>
> This poses a small problem. I'm not sure whether this is a
> Win32-related issue, or it's because the PRIMARY selection isn't fully
> configured.
You need to select something first :-)
>>> from Tkinter import *
>>> tk = Tk(); e = Entry(tk); e.pack()
>>> # Type 'foo' into the Entry, then highlight it
...
>>> e.selection_get()
'foo'
e.selection_get() will raise TclError if the widget you call it on has
nothing selected.
> >>> g.selection_get(selection='CLIPBOARD')
I didn't know about this, though..
--
John.
--
http://mail.python.org/mailman/listinfo/python-list
Re: return None
geon wrote: > Ximo wrote: > > Can I do a function which don't return anything? > Nothing is None, or isnt? A woodman was carrying a sack full of chopped wood on his back. His sack was heavy and filled beyond its limit. The man, bent under his bulky burden, was struggling not to drop any of the wood pieces as he walked. However, the poor man couldn't avoid tripping over a stone on the road and half of his load fell out of their precarious pile. Another man happened to be passing by and saw the mishap. `If I load those fallen pieces of wood back into your back sack, what would you give me?' he asked. `Nothing.' said the man carrying the wood. `That's acceptable.' agreed the other man. He collected all the chopped wood scattered on the road and crammed them back into the sack of the woodman. When done, he asked for his payment. The woodman was baffled. `I told you, I would give you nothing.' he said. `Yes. And that's what I want. Nothing.' said the other, `Give me my nothing!' After some quarrel, the two men decided to let the qadi solve their problem. Nasreddin Hodja was on duty at the time. He listened to both men earnestly. Then he addressed the man who was expecting his payment of nothing. `My dear fellow, could you please lift the far right corner of that rug on the floor and check what is underneath?' The man did as he was told and looked under the rug. `What do you see?' asked the Hodja. `Nothing.' said the man. 'Well, there's your payment.' said the Hodja. 'Take it and go!' -- John. -- http://mail.python.org/mailman/listinfo/python-list
Searching through a list of tuples
I often find myself storing data in a list of tuples, and I want to ask questions like "what is the index of the first tuple whose 3rd element is x", or "give me the first tuple whose 2nd element is y". I know I can do [elem for elem in lst if elem[3] == x][0] or (elem for elem in lst if elem[2] == y).next() but it feels kinda ugly; is there a better way? (something like lst.index(x, key=..) or lst.find(y, key=..) would be nice) -- John. -- http://mail.python.org/mailman/listinfo/python-list
