cubicweb #344521 regression in debian stable [deprecated]

Setting up cubicweb-web (3.3.3-2) ...
Compiling /usr/lib/python2.4/site-packages/cubicweb/web/test/unittest_form.py ...
SyntaxError: ('future feature with_statement is not defined',)

pycentral: pycentral pkginstall: error byte-compiling files (98)
pycentral pkginstall: error byte-compiling files (98)
dpkg: error processing cubicweb-web (--configure):

I don't understand why python2.4 is mentioned here.

priorityimportant
typebug
done in3.3.4
load0.000
load left0.000
closed by<not specified>