Merge the two validating functions by using a callback which accepts keyword arguments

[ghost]

The two validating functions could be merged two one dynamic validating function which accepts a keyword (e.g. called "floattype") so that depending on value of that keyword argument a different regex is compiled.

See this PSEUDO-CODE:

def validate_input(self,name,index,mode,floattype=None):

    if floattype == "unit interval":
        regex = re.compile(r'^0(\.[0-9]*)?$|^1(\.0?)?$|^$')
    regex = re.compile(r'^[+-]?((\d+\.?\d*)|(\.\d+))$|^$')

    for var in self.input_vars:
        if name == str(var):
            if not regex.match(var.get()):
                var.set(var.get()[:-1])
                self.master.bell()

See also these stackoverflow-posts:

Pass Multiple Arguments to Callback for a StringVar in Tkinter
How can I pass arguments to Tkinter button's callback command?

[ghost]

On the other hand I don't really find the suggested methods in the stackoverflow-posts readable, so it could also be a trade-off question (readability vs. length of code)