[Python-Dev] deleting setdefaultencoding iin site.py is evil

Chris Withers chris at simplistix.co.uk
Thu Aug 27 10:01:33 CEST 2009

Martin v. Löwis wrote:
>> - If people were somehow relying on sys not having an attribute called
>> _setdefaultencoding, or were relying on stuffing an attribute into sys
>> called _setdefaultencoding then... well... that seems pretty unlikely ;-)
> If people were using the reload trickery, that would break if the
> function changed its name.

No it doesn't:

$ svn diff
Index: Lib/site.py
--- Lib/site.py (revision 74552)
+++ Lib/site.py (working copy)
@@ -540,6 +540,7 @@
      if hasattr(sys, "setdefaultencoding"):
+        sys._setdefaultencoding = sys.setdefaultencoding
          del sys.setdefaultencoding

 >>> import sys
 >>> sys._setdefaultencoding
<built-in function setdefaultencoding>
 >>> sys.setdefaultencoding
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'setdefaultencoding'

 >>> reload(sys)
<module 'sys' (built-in)>
 >>> sys.setdefaultencoding
<built-in function setdefaultencoding>
 >>> sys._setdefaultencoding
<built-in function setdefaultencoding>


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