On 1/15/2014 3:16 PM, eneskri...@gmail.com wrote:
While working with tkinter in python 3.3, I had the following problem.
Please paste working code that people can experiment with.
from tkinter import *
def get_text(event):
If this were a method, (which the indent of the body suggests it once
was) it would have to have a 'self' parameter, and you would have to
bind a bound method.
self.number_of_competitors = entered_text.get()
Since it is just a function, and has no 'self' parameter, this raises
NameError. I condensed the function to
try:
int(entered_text.get())
root.destroy()
except ValueError:
label.config(text = "Enter the number of competitors.
Please enter a number.")
try:
self.number_of_competitors = int(self.number_of_competitors)
except:
Bare excepts are bad.
pass
if type(self.number_of_competitors) == int:
root.destroy()
else:
label.config(text = "Enter the number of competitors. Please enter
a number.")
root = Tk()
label = Label(root, text = "Enter the number of competitors.")
label.pack(side = TOP)
entered_text = Entry(root)
Since Entry only allows one line, I would have thought that it should
take a command=func option invoked by \n. Instead, it seems to swallow
newlines.
entered_text.pack()
Button(root, text = "Submit", command = get_text).pack()
As near as I can tell, the Button button-press event in *not* bound to
get_text but to a fixed event handler that calls get_text *without* an
argument.
root.bind('<Enter>', get_text)
This does bind to an event so that it does call with an event arg. I
just removed this and the window acts as it should.
Since get_event ignores event, event=None should make it work either
way. However, when I try that, the window disappears without being
touched, as if \n is randomly generated internally. So I would say to
skip this until you know more than I do.
root.mainloop()
This is a buggy part of the code. When I run it, instead of doing what it
should do, it responds to all events BUT enter. I'm not sure if this error is
on tkinters or my side. Please help!
--
Terry Jan Reedy
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