Pyro and class init() with another class instance

Hello,

I am new to Pyro, and I feel I need some advice.
With one of my first test scripts I run into problems when I try to use a
method of an class object from inside another class.
a.method() works
b.a.method() is not working

Maybe my point is better to understand with some code. Here is a test case:

##############
#1
#starting the name server in a shell with
#python -m Pyro4.naming

##############################
#2
#test script for server
'''
pyrotest_server
'''
import Pyro4

class TestA():
    def __init__(self):
        #just a variable var
        self.var = 123
    def get_var(self):
        return self.var

class TestB():
    def __init__(self, instance_TestA):
        #object b of type TestA
        self.b_a = instance_TestA

if __name__ == '__main__':
    server_a = TestA()
    server_b = TestB(server_a)
    daemon=Pyro4.Daemon()           # make a Pyro daemon
    ns=Pyro4.locateNS()             # find the name server
    uri=daemon.register(server_a)   # register as a Pyro object
    ns.register("server_a", uri)    # register the object with a name in
the name server
    print 'server_a registered'
    uri=daemon.register(server_b)   # register as a Pyro object
    ns.register("server_b", uri)    # register the object with a name in
the name server
    print 'server_b registered'
    print "Ready."
    daemon.requestLoop()

##########################
#3
#starting the server test script
##########################
#4
#shell output
C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py:155:
UserWarnin
g: HMAC_KEY not set, protocol data may not be secure
  warnings.warn("HMAC_KEY not set, protocol data may not be secure")
server_a registered
server_b registered
Ready.

###########################
#5
#client test script
'''
pyrotest_client.py
'''
import Pyro4

if __name__ == '__main__':
    client_a = Pyro4.Proxy("PYRONAME:server_a")
    print "client_a:", client_a
    print "client_a.var = ",client_a.var
    print "client_a.getA() = ",client_a.get_var()
    client_b = Pyro4.Proxy("PYRONAME:server_b")
    print "client_b:", client_b
    print "client_b.b_a = ",client_b.b_a
    print "client_b.b_a.var = ",client_b.b_a.var
    print "client_b.b_a.get_var() = ",client_b.b_a.get_var()

#############################
#6
#starting client test script
#############################
#7
#shell output
C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py:155:
UserWarnin
g: HMAC_KEY not set, protocol data may not be secure
  warnings.warn("HMAC_KEY not set, protocol data may not be secure")
client_a: <Pyro4.core.Proxy at 0x250f3c8, not connected, for
PYRONAME:server_a>
client_a.var =  <Pyro4.core._RemoteMethod object at 0x0000000002A4B3C8>
client_a.getA() =  123
client_b: <Pyro4.core.Proxy at 0x2a4b3c8, not connected, for
PYRONAME:server_b>
client_b.b_a =  <Pyro4.core._RemoteMethod object at 0x0000000002A4B438>
client_b.b_a.var =  <Pyro4.core._RemoteMethod object at 0x0000000002A4B470>
client_b.b_a.get_var() =
Traceback (most recent call last):
  File "C:\Users\mdk\workspace\src\pyrotest_client.py", lin
e 15, in <module>
    print "client_b.b_a.get_var() = ",client_b.b_a.get_var()
  File "C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py",
line
149, in __call__
    return self.__send(self.__name, args, kwargs)
  File "C:\Python27\lib\site-packages\pyro4-4.17-py2.7.egg\Pyro4\core.py",
line
294, in _pyroInvoke
    raise data
AttributeError: TestB instance has no attribute 'b_a.get_var'



Any help is welcome.
Daniel

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