Re: Accessing class variables in staticmethods.
Sam wrote: > On 21 Jan 2007 12:49:17 -0800, Ramashish Baranwal > <[EMAIL PROTECTED]> wrote: > > class Base: > > staticvar = 'Base' > > > > @staticmethod > > def printname(): > > # this doesn't work > > # print staticvar > > # this does work but derived classes wouldn't behave as I want > > print Base.staticvar > > > > class Derived(Base): > > staticvar = 'Derived' > > > > Base.printname() # should print 'Base' > > Derived.printname() # should print 'Derived' > > > > Any idea on how to go about this? Also from a staticmethod how can I > > find out other attributes of the class (not objects)? Do static methods > > get some classinfo via some implicit argument(s)? > > No, staticmethods get told nothing about the class they're being > defined in. What you want is a classmethod, which gets passed the > class to work with. > > Using classmethods, your code becomes: > > #untested, bear in mind > class Base: > staticvar = 'Base' > > @classmethod > def printname(cls): > print cls.staticvar > > class Derived(Base): > staticvar = 'Derived' > > Base.printname() #prints 'Base' > Derived.printname() #prints 'Derived' > > Incidentally, you can also use cls.__name__ for this purpose, but I > guess that your actual motivation for this is more complicated than > class names. Thanks Sam, using classmethod works. You guessed it correctly, my actual motivation is more complicated but on the same line. -Ram -- http://mail.python.org/mailman/listinfo/python-list
Re: Accessing class variables in staticmethods.
On 21 Jan 2007 12:49:17 -0800, Ramashish Baranwal <[EMAIL PROTECTED]> wrote: > class Base: > staticvar = 'Base' > > @staticmethod > def printname(): > # this doesn't work > # print staticvar > # this does work but derived classes wouldn't behave as I want > print Base.staticvar > > class Derived(Base): > staticvar = 'Derived' > > Base.printname() # should print 'Base' > Derived.printname() # should print 'Derived' > > Any idea on how to go about this? Also from a staticmethod how can I > find out other attributes of the class (not objects)? Do static methods > get some classinfo via some implicit argument(s)? No, staticmethods get told nothing about the class they're being defined in. What you want is a classmethod, which gets passed the class to work with. Using classmethods, your code becomes: #untested, bear in mind class Base: staticvar = 'Base' @classmethod def printname(cls): print cls.staticvar class Derived(Base): staticvar = 'Derived' Base.printname() #prints 'Base' Derived.printname() #prints 'Derived' Incidentally, you can also use cls.__name__ for this purpose, but I guess that your actual motivation for this is more complicated than class names. -- http://mail.python.org/mailman/listinfo/python-list
Accessing class variables in staticmethods.
Hi, I want to access a static variable in a staticmethod. The variable can be redefined by derived classes and that should be reflected in base's staticmethod. Consider this trivial example- class Base: staticvar = 'Base' @staticmethod def printname(): # this doesn't work # print staticvar # this does work but derived classes wouldn't behave as I want print Base.staticvar class Derived(Base): staticvar = 'Derived' Base.printname() # should print 'Base' Derived.printname() # should print 'Derived' Any idea on how to go about this? Also from a staticmethod how can I find out other attributes of the class (not objects)? Do static methods get some classinfo via some implicit argument(s)? Thanks in advance, Ram -- http://mail.python.org/mailman/listinfo/python-list
