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 to deal for it. This is a perfectly normal thing that needs to be done. Any ideas? Continue reading...
