Tkinter

[Jay]

I wold like to be able to generate buttons from a list in a file.
How would I go about making each button have a different command,
Lets say make the button print its label instead of print "."

The problem I have is I don't know what the list is going to be until
it is opened or how big so I carnet make a def for each.

And I don't know how to do it with a loop

Thanks

------Code-------

from Tkinter import *

class App:
def __init__(self, root):

self.DisplayAre aListsFrame = Frame(root)
self.DisplayAre aListsFrame.pac k()

Lists = ["A1","B2","C3", "D4"]

for i in Lists:
self.DisplayAre aListButton = Button(
self.DisplayAre aListsFrame,
text=i,
command=self.Li stButtonCommand )
self.DisplayAre aListButton.pac k(side=LEFT,pad x=10)

def ListButtonComma nd(self):
print "."

root = Tk()
app = App(root)
root.mainloop()

[Fredrik Lundh]

Re: Tkinter

"Jay" wrote:
[color=blue]
> I wold like to be able to generate buttons from a list in a file.
> How would I go about making each button have a different command,
> Lets say make the button print its label instead of print "."
>
> The problem I have is I don't know what the list is going to be until
> it is opened or how big so I carnet make a def for each.[/color]

def is an executable statement, and creates a new function object
everytime it's executed. if you want a new function for each pass
through a loop, just put the def inside the loop:
[color=blue]
> from Tkinter import *
>
> class App:
> def __init__(self, root):
>
> self.DisplayAre aListsFrame = Frame(root)
> self.DisplayAre aListsFrame.pac k()
>
> Lists = ["A1","B2","C3", "D4"]
>
> for i in Lists:[/color]

def callback(text=i ):
print text
[color=blue]
> self.DisplayAre aListButton = Button(
> self.DisplayAre aListsFrame,
> text=i,
> command=callbac k)
> self.DisplayAre aListButton.pac k(side=LEFT,pad x=10)
>
> root = Tk()
> app = App(root)
> root.mainloop()[/color]

the only think that's a little bit tricky is scoping: you can access all
variables from the __init__ method's scope from inside the callbacks,
but the callbacks will be called after the loop is finished, so the "i"
variable will be set to the *last* list item for all callbacks.

to work around this, you have to explicitly pass the *value* of "i" to
to the callback; the "text=i" part in the above example uses Python's
default argument handling to do exactly that.

</F>

[Jay]

Re: Tkinter

I still dont quite get it, is their sum kind of way you can [def Newdef
+ i()] for example so that the def is different from the string, all
the buttons now have numbers on

If I am not mistaken Fredrik Lundh rote the tutorial Learning to
program (Python) www.freenetpages.co.uk/hp/alan.gauld/ and

https://www.effbot.org

If this is the same person then thank you for everything I no about
python it seams what ever I try and learn about Python it is always you
who helps or has wrote docs to help Newbie's and well everyone
really.

---code---
from Tkinter import *

class App:
def __init__(self, root):

self.DisplayAre aListsFrame = Frame(root)
self.DisplayAre aListsFrame.pac k()

Lists = ["A1","B2","C3", "D4"]
for i in Lists:
def i():
print i
self.DisplayAre aListButton = Button(
self.DisplayAre aListsFrame,
text=i,
command=i)
self.DisplayAre aListButton.pac k(side=LEFT,pad x=10)



root = Tk()
app = App(root)
root.mainloop()

[Ravi Teja]

Re: Tkinter

Documentation isn't his only contribution, BTW. He wrote a whole bunch
of highly useful modules for Python as well.

http://effbot.org/downloads/