[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Raymond Hettinger]

Raymond Hettinger  added the comment:

There will always be classes that don't call super() init, sometimes for 
efficiency and sometimes to preserve their internal invariants.

Also, __init__() isn't the only method affected.  For a perfectly cooperative 
class, all of the methods would need to call super().

See how to handle this in the "How to Incorporate a Non-cooperative Class" 
section of: https://rhettinger.wordpress.com/2011/05/26/super-considered-super/

--
nosy: +rhettinger
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Irit Katriel]

Change by Irit Katriel :


--
versions: +Python 3.10, Python 3.9 -Python 3.5

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Yury Selivanov]

Changes by Yury Selivanov yselivanov...@gmail.com:


--
versions: +Python 3.5 -Python 3.3

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Daniel Urban]

Changes by Daniel Urban urban.dani...@gmail.com:


--
nosy: +durban

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Benjamin Peterson]

New submission from Benjamin Peterson benja...@python.org:

Why does it matter? They both inherit from object, so there's no one to pass 
parameters to.

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nosy: +benjamin.peterson

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Sagiv Malihi]

Sagiv Malihi sagivmal...@gmail.com added the comment:

Example:

class A(object):
 def __init__(self):
  print initializing something very important
  # and then pay it forward...
  super(A, self).__init__()

class B(list, A): pass

b = B()
# A's init is never called...

--

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[Sagiv Malihi]

Changes by Sagiv Malihi sagivmal...@gmail.com:


--
nosy: +Sagiv.Malihi

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[issue8733] list type and UserList do not call super in __init__ and therefore, they cannot be parents in a multiple inheritence scheme

[alon horev]

Changes by alon horev alo...@gmail.com:


--
components: Extension Modules
nosy: alonho
priority: normal
severity: normal
status: open
title: list type and UserList do not call super in __init__ and therefore, they 
cannot be parents in a multiple inheritence scheme
type: behavior
versions: Python 3.3

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