mercurial broken

[David DEMELIER]

Hello

after an upgrade to 1.7.1, I can't use mercurial anymore :

markand at Melon ~/devel/dotfiles $ hg pull
abort: No module named thread!
Exception AttributeError: "'httpsrepository' object has no attribute
'urlopener'" in <bound method httpsrepository.__del__ of
<mercurial.httprepo.httpsrepository object at 0x80184b110>> ignored

what is happening ?

Kind regards,

-- 
Demelier David