[Python-bugs-list] [ python-Bugs-472234 ] type(obj) calls type->tp_init

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Bugs item #472234, was opened at 2001-10-17 13:45
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=472234&group_id=5470

Category: Type/class unification
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Roeland Rengelink (rengelink)
Assigned to: Guido van Rossum (gvanrossum)
Summary: type(obj) calls type->tp_init

Initial Comment:
In 2.2a4 Consider:

class Meta(type):
	def __init__(self, *args):
		print 'Meta.__init__ called'

class Object(object):
	 __metaclass__ = Meta

obj = Object()

print type(obj)

will print

Meta.__init__ called
Meta.__init__ called
<class Object.....>

The second call to Meta.__init__ results from the
type(obj) call. This is because type(obj) is special
cased in type_new(...) rather than type_call(...). 

Although it's rather useless to define an __init__ in a
class derived from type (for metaclasses it's a better
idea to override __new__). I do think the call of
Meta.__init__ in type(obj) is a bug.

Thanks,

Roeland



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