Persistence of *.html.py file in temporary directory

[ggemmill]

Environment Linux, Mageia 7 x86_64
Mako assumes incorrectly that if a .html.py file exists in the specified temporary directory:
tmpl = Template(filename='weather.html', module_directory='/tmp/mako_modules')
that the template does not need to be re-compiled. I have been testing a development version of a python script alongside the production version, with a slight difference in the template. Mako just uses whichever version was last compiled.

[zzzeek]

hi there -

mako uses the last modification time of the template file + the py file to determine if a recompile is needed. the code that does this is here: https://github.com/sqlalchemy/mako/blob/master/mako/template.py#L404

so check the modification time of your .py file is not perhaps in the future relative to your machine's clock, or something like that.

[UlrichEckhardt]

I believe this needs to be documented better how this works and that a deployment should purge or at least refresh the modules. I just lost quite some time over a bad cache: The scenario here is an upgrade not of my template files, but of the the ecosystem around it, i.e. going from Python 2 to 3 and upgrading Mako in the run. Needless to say, this failed, since the old cache used Python 2 features not available in 3.