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Re: Validating Entry in tkinter

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Saul Spatz wrote:

> That doesn't work, I'm being stupid,  The user might type anywhere in the
> string, not just at the end.  I need
> 
> return all([c in '1234567890abcdefABCDEF ' for c in after])

Ah, you found out already. Here's what I've come up with in the meantime.
I also changed the command to a tuple as in the example pointed out by 
Wolfgang.

import tkinter as tk

def is_valid_fromhex(s):
    for pad in "", "0":
        try:
            bytes.fromhex(s + pad)
        except ValueError:
            pass
        else:
            return True
    return False

def validate(before, after):
    print(before, "-->", after)
    return is_valid_fromhex(after)

if __name__ == "__main__":
    root = tk.Tk()
    cmd = (root.register(validate), "%s", "%P")
    entry = tk.Entry(root, validate="all", validatecommand=cmd)
    entry.pack()
    entry.focus_set()
    root.mainloop()

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Re: Validating Entry in tkinter Saul Spatz <saul.spatz@gmail.com> - 2011-07-25 05:12 -0700
  Re: Validating Entry in tkinter Peter Otten <__peter__@web.de> - 2011-07-25 14:31 +0200
    Re: Validating Entry in tkinter Terry Reedy <tjreedy@udel.edu> - 2011-07-25 13:24 -0400
    Re: Validating Entry in tkinter Peter Otten <__peter__@web.de> - 2011-07-25 21:08 +0200
      Re: Validating Entry in tkinter rantingrick <rantingrick@gmail.com> - 2011-07-25 12:55 -0700
    Re: Validating Entry in tkinter python@bdurham.com - 2011-07-25 16:26 -0400
    Re: Validating Entry in tkinter Peter Otten <__peter__@web.de> - 2011-07-25 23:03 +0200
    Re: Validating Entry in tkinter "Malcolm Greene" <mgreene@bdurham.com> - 2011-07-25 17:54 -0400

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