python classes

In [91]: class myclass:
   ....:     def __init__(self):
   ....:         self.f_name = "david"
   ....:     def f_name(self, first_name):
   ....:         self.f_name = first_name
   ....:         print "Your first name is: ", self.f_name
   ....:

In [92]: bio = myclass

In [93]: bio.f_name("frank")
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
/home/oquidave/Documents/<ipython-input-93-d68dda092f63> in <module>()
----> 1 bio.f_name("frank")

TypeError: unbound method f_name() must be called with myclass instance as first argument (got str instance instead)