Overriding class variables in python

Question

I\'m trying to understand a bit how Python (2.6) deals with class, instances and so on, and at a certain point, I tried this code:

#/usr/bin/python2.6

class Bas         


        

Answer 1

def showDefaultValue(cls, defl=default):

means that default gets evaluated when the function is defined, as usual in Python. So the definition looks like this then:

def showDefaultValue(cls, defl="default value in base"):

This value of defl is stored as a default argument on the function object and used when you call the method without arguments. You can look at the defaults of a function like print Descend.showDefaultValue.im_self.default to validate this.

If you want to get the default from the current class then you have get it from there:

@classmethod
def showDefaultValue(cls, defl=None):
    if defl is None:
        defl = cls.default
    print "defl == %s" % (defl)