Python: override __init__ args in __new__

Posted by EoghanM on Stack Overflow See other posts from Stack Overflow or by EoghanM
Published on 2010-03-18T07:23:03Z Indexed on 2010/03/18 7:41 UTC
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I have a __new__ method as follows:

class MyClass(object):
   def __new__(cls, *args):
      new_args = []
      args.sort()
      prev = args.pop(0)
      while args:
         next = args.pop(0)
         if prev.compare(next):
            prev = prev.combine(next)
         else:
            new_args.append(prev)
            prev = next
         if some_check(prev):
            return SomeOtherClass()
      new_args.append(prev)
      return super(MyClass, cls).__new__(cls, new_args)

   def __init__(self, *args):
       ...

However, this fails with a deprecation warning:

DeprecationWarning: object.__new__() takes no parameters

SomeOtherClass can optionally get created as the args are processed, that's why they are being processed in __new__ and not in __init__

What is the best way to pass new_args to __init__?

Otherwise, I'll have to duplicate the processing of args in __init__ (without some_check)

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