How to validate entry is alphanumeric,Tkinter

[katyalrikin]

I have an entry that i would like to make sure that it is only alphanumeric. how can i do so?

def validate_code(var):
    new_value = var.get()
    try:
        new_value == '' or int(new_value)
        validate_code.old_value = new_value
    except:
        var.set(validate_code.old_value)

This is what I have so far. I already check if it is an int, now how to check if it is alphabet.
Thanks

[dwblas]

import string and test for new_value in string.letters
Try this simple test of your current logic

def validate_code(new_value):
     ##new_value = var.get()
     try:
         new_value == '' or int(new_value)
         validate_code.old_value = new_value
     except:
         print "error", validate_code.old_value

validate_code("@")
validate_code(" ")