Tk button help

[Laura Creighton]

You can't pass arguments to bindings like:
	Button(top, text='Enter Leaf N', command = test.run(G)).pack(side=RIGHT, fill = BOTH)

you just want the NAME of the function.  This works great when there are no
arguments.  If there are, get out the lambda.

This works:
from __future__ import nested_scopes #I am still using 2.1
from Tkinter import *

def run(arg):

    from tkSimpleDialog import askfloat
    N = askfloat('N', 'Leaf N (50 - 250 mmol m-2) ')
    print N, arg



###########################
if __name__ == '__main__':

    root = Tk()
    quit = Button(root, text="QUIT", fg="red", command=root.quit)
    quit.pack(side='left')

    B = Button(root, text='Enter Leaf N', command=lambda : run('hi there'))
    B.pack(side=RIGHT, fill= BOTH)
    root.mainloop()

So you might want command=lambda s=self, arg=4.0 : s.run(arg) or some such.

Laura Creighton