[Python-Dev] switching on -3 from within a program? (original) (raw)

Anthon van der Neut anthon at mnt.org
Wed Sep 17 12:19:03 CEST 2008

Hi Nick,

I am aware of that (but others might not, so you are right to point this out).

I did follow both Christian's and Benjamin's suggestions. The implementation at the mod_wsgi C level, which is before any module loading is more permanent, but the ctypes trick doesn't require an apache2 restart, which is somewhat more comfortable.

Anthon

Nick Coghlan wrote:

Benjamin Peterson wrote:

def engagepy3kwarning(): flag = ctypes.cint.indll(ctypes.pythonapi, "PyPy3kWarningFlag") flag.value = 1 Note that tricks like this won't necessarily enable all python 3 warnings for modules that have been imported before the flag gets set. To avoid unnecessary performance penalties as a result of Py3k warnings, modules are permitted to do things like: def func(): # Do whatever if sys.py3kwarning: origfunc = func def func(): warnings.py3kwarn("Goes away in 3.0") origfunc() Modules that are first imported after the flag has been set will obviously have all of their warnings properly enabled. Cheers, Nick.

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