Message 60213 - Python tracker

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Author	arigo
Recipients	arigo
Date	2008-01-19.18:55:48
SpamBayes Score	0.00045800293
Marked as misclassified	No
Message-id	<1200768950.55.0.245752373825.issue1875@psf.upfronthosting.co.za>
In-reply-to

Content
Can you guess why importing the attached x.py does nothing, without printing "hello" at all? The real issue shown in that example is that 'return' and 'yield' outside a function are ignored instead of giving a SyntaxError if they are optimized away by 'if 0:'. (Hint about x.py: the yield sets the CO_GENERATOR flag before it gets optimized away. So clearly, that's a way to comment out a whole module -- just put "if 0: yield" anywhere at top-level...)

Can you guess why importing the attached x.py does nothing, without
printing "hello" at all?

The real issue shown in that example is that 'return' and 'yield'
outside a function are ignored instead of giving a SyntaxError if they
are optimized away by 'if 0:'.  

(Hint about x.py: the yield sets the CO_GENERATOR flag before it gets
optimized away.  So clearly, that's a way to comment out a whole module
-- just put "if 0: yield" anywhere at top-level...)

History
Date	User	Action	Args
2008-01-19 18:55:50	arigo	set	spambayes_score: 0.000458003 -> 0.00045800293 recipients: + arigo
2008-01-19 18:55:50	arigo	set	spambayes_score: 0.000458003 -> 0.000458003 messageid: <1200768950.55.0.245752373825.issue1875@psf.upfronthosting.co.za>
2008-01-19 18:55:49	arigo	link	issue1875 messages
2008-01-19 18:55:49	arigo	create