OOP in Python

[D-Man]

On Wed, Jun 20, 2001 at 10:54:50AM -0700, Jonas Bengtsson wrote:
| Ok I admit - I am a Python-newbie!
| 
| What about local variables and class variables when dealing with
| classes?
| With local vars I mean temporaryly used variables in a function. Will
| they be treated as 'normal' instance attributes? Do I have to delete
| them by myself when I'm leaving a function?
| With class vars I mean if many class instances of a class may share a
| variable. In C++ this is accomplished by a static variable. How do I
| do in Python?

class Demo :

    # this is a class variable,  ("static")
    var1 = "Hello"

    # this function/method is called immediately after construction.
    # It is supposed to inialize the instance, referred to by the
    # first argument.
    def __init__( self ) :
        # this creates an instance variable
        self.var2 = "World"

    def meth1( self ) :
        # this is a local variable.  It is not prefixed by 'self.' and
        # will be destroyed upon completion of the function
        var3 = "."

        # one of the following lines accesses the class variable
        # through the class object, the other through the instance
        # object
        print Demo.var1 + " " + self.var2 + var3
        print self.var1 + " " + self.var2 + var3
        

demo_obj = Demo()
demo_obj.meth1()



HTH,
-D