inheritance from xmlrpclib.ServerProxy in python
Why this code doesn't work ?
#!/usr/bin/python2
from xmlrpclib import ServerProxy
class ServerProxy1(ServerProxy):
def __str__(self):
return str(self.__host)
proxy = ServerProxy1("http://workshop:58846/")
print proxy
Original_str_:
def __repr__(self):
return (
"" %
(self.__host, self.__handler)
)
__str__ = __repr__
Result:
File "/usr/lib/python2.7/xmlrpclib.py", line 793, in close
raise Fault(**self._stack[0])
xmlrpclib.Fault: :method "_ServerProxy1__host.__str__" is not supported'>
The answer is hiding in this SO post
The member self.__host in class ServerProxy was declared using the double-underscore naming that's meant to indicate that it shouldn't be accessed by derived classes. To do this, the interpreter mangles its name internally in the form _className__memberName -- Python isn't C++, and treats that 'private' notation as a strong hint, not as an absolute prohibition.
When code is written with the double underscore prefix, you can access it like
class ServerProxy1(ServerProxy):
def __str__(self):
return str(self._ServerProxy__host)
..but you shouldn't be surprised if a future version of the ServerProxy class changes its internal implementation and breaks your code.