You can do this when you want to inject some value into your page, but not from your calculation.
code section:
@flask_app.context_processor
def inject_yourstuff():
return {
'publish_date':datetime.datetime.utcnow(),
'App_ver': '1.0.1.223'
}
in your page html, you have to have these two section defined:
<div>
My blog Application {{ App_ver }}
</div>
<div>
copyright {{ publish_date }} snughut.com --All rights reserved.
</div>