Question

I try to make something like that :

class oObject(object):
    def __init__(self, x = 0, y = 0, z = 0):
        self.x = x
        self.y = y
        self.z = z

def asString (self, value):
    return str(value)

vector = oObject(5,5,5)

# So i can do
asString(vector.x)

# But I want this kind of syntax
vector.x.asString()

It’s just an example, i don’t really want to convert integrer into a string. It’s more about class into a class.

Answer 1

You could either write a custom method for your oObject class that returns the string of the given key, or maybe you could write a custom Variant class and wrap your values:

class oObject(object):
    def __init__(self, x = 0, y = 0, z = 0):
        self.x = Variant(x)
        self.y = Variant(y)
        self.z = Variant(z)

class Variant(object):
    def __init__(self, obj):
        self._obj = obj

    def __repr__(self):
        return '<%s: %s>' % (self.__class__.__name__, self.asString())

    def __str__(self):
        return self.asString()

    def asString(self):
        return str(self._obj)

    def value(self):
        return self._obj

Check out this reference as to how PyQt4 does it, with the QVariant class, which is actually from Qt. Normally python wouldn’t need this type, but it was necessary for C++ to represent the multiple types.