Old-style classes remain old-style for compatibility reasons. You have some options, though:
1. Set the TWISTED_NEWSTYLE environment variable [1] to make all such old-style classes new-style. 2. When subclassing it, also subclass object, making the result new-style. 3. Switch to Python 3, where all-classes are new-style. Option 3 is the best, since we will drop Python 2.7 support soon enough. Option 1 may be helpful when migrating a codebase. ---Tom [1]: https://github.com/twisted/twisted/blob/c0a51509974e995537212efc5074140388585da6/src/twisted/python/compat.py#L61 On Fri, Feb 7, 2020, at 9:44 PM, Maarten ter Huurne wrote: > On Saturday, 8 February 2020 01:50:04 CET Go Luhng wrote: > > I am creating a child class > > `Child(twisted.internet.protocol.DatagramProtocol)` to implement a > > custom UDP multicast protocol. > > > > I need to add an `__init__()` to `Child`, but as part of that I need > > to call `super()` which is impossible because `DatagramProtocol` is > > old-style. > > > > How should I proceed? > > There is no __init__() in DatagramProtocol or in its superclass > AbstractDatagramProtocol, so you can just skip the call. > > > Also, why are there old-style classes in the latest release of > > Twisted? > > I don't know the reason, but it seems to be deliberate, since > AbstractDatagramProtocol is annotated with @_oldStyle in the source. > > Bye, > Maarten _______________________________________________ Twisted-Python mailing list Twisted-Python@twistedmatrix.com https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
