I am attempting to do what should be very simple and check to see if a value in an Entry field is a valid and real number. The str.isnumeric() method does not account for "-" negative numbers, or "." decimal numbers.
I tried writing a function for this:
def IsNumeric(self, event): w = event.widget if (not w.get().isnumeric()): if ("-" not in w.get()): if ("." not in w.get()): w.delete(0, END) w.insert(0, '')
This works just fine until you go back and type letters in there. Then it fails.
I researched the possibility of using the ".split()" method, but i could not figure out a reliable regex type deal for it.
This is a perfectly normal thing that needs to be done. Any ideas?