Message 161449 - Python tracker

➜

This issue tracker has been migrated to GitHub , and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

In-reply-to
Author	amaury.forgeotdarc
Recipients	Frederick.Ross, amaury.forgeotdarc
Date	2012年05月23日.18:52:29
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1337799150.13.0.141984493846.issue14891@psf.upfronthosting.co.za>

Content
What fails here is the evaluation of "x", not the assignment! You are right concerning the assignment, the outer definition has no effect at all. The very presence of "x = " in the function code turns x into a local variable for the whole function; so 'x + "a"' fails because the local variable has not value yet. Python, unlike Lisp, defines scopes lexically, not dynamically. There is no "previous" binding, but "local" or "outer" scopes.

Content

What fails here is the evaluation of "x", not the assignment!
You are right concerning the assignment, the outer definition has no effect at all. The very presence of "x = " in the function code turns x into a local variable for the whole function; so 'x + "a"' fails because the local variable has not value yet.
Python, unlike Lisp, defines scopes lexically, not dynamically. There is no "previous" binding, but "local" or "outer" scopes.

History
Date	User	Action	Args
2012年05月23日 18:52:30	amaury.forgeotdarc	set	recipients: + amaury.forgeotdarc, Frederick.Ross
2012年05月23日 18:52:30	amaury.forgeotdarc	set	messageid: <1337799150.13.0.141984493846.issue14891@psf.upfronthosting.co.za>
2012年05月23日 18:52:29	amaury.forgeotdarc	link	issue14891 messages
2012年05月23日 18:52:29	amaury.forgeotdarc	create

homepage