<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_callable(self, classname, cname):
 """Return a function or method object appropriate to fulfill a request classname -- The CIM class name associated with the request. cname -- The function or method name to look for. """


        callable = None
        if classname in self.provregs:
            provClass = self.provregs[classname]
            if hasattr(provClass, cname):
                callable = getattr(provClass, cname)
        elif hasattr(self.provmod, cname):
            callable = getattr(self.provmod, cname)
        if callable is None:
            raise pywbem.CIMError(
                pywbem.CIM_ERR_FAILED,
                "No provider registered for %s or no callable for %s:%s on " \
                "provider %s" % (classname, classname, cname, self.provid))
        return callable