Message 265334 - Python tracker

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In-reply-to
Author	eltoder
Recipients	Arfrever, barry, bru, eli.bendersky, eltoder, ethan.furman, facundobatista, iyogeshjoshi, juggernaut, mark.dickinson, pitrou, rhettinger, serhiy.storchaka, skrah, vstinner
Date	2016年05月11日.18:53:27
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1462992807.78.0.0857920263338.issue23640@psf.upfronthosting.co.za>

Content
There's a similar issue with replace() methods on date/time/datetime classes. They create instances of derived types without calling derived __new__/__init__, thus potentially leaving those uninitialized. >>> from datetime import date >>> class D(date): ... def __init__(self, y, m, d): ... self.y = y >>> D(2016,1,1).y 2016 >>> D(2016,1,1).replace(2015).y Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'D' object has no attribute 'y'

Content

There's a similar issue with replace() methods on date/time/datetime classes. They create instances of derived types without calling derived __new__/__init__, thus potentially leaving those uninitialized.
>>> from datetime import date
>>> class D(date):
... def __init__(self, y, m, d):
... self.y = y
>>> D(2016,1,1).y
2016
>>> D(2016,1,1).replace(2015).y
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
AttributeError: 'D' object has no attribute 'y'

History
Date	User	Action	Args
2016年05月11日 18:53:27	eltoder	set	recipients: + eltoder, barry, rhettinger, facundobatista, mark.dickinson, pitrou, vstinner, Arfrever, eli.bendersky, skrah, ethan.furman, serhiy.storchaka, bru, juggernaut, iyogeshjoshi
2016年05月11日 18:53:27	eltoder	set	messageid: <1462992807.78.0.0857920263338.issue23640@psf.upfronthosting.co.za>
2016年05月11日 18:53:27	eltoder	link	issue23640 messages
2016年05月11日 18:53:27	eltoder	create

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