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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