How to load jinja template directly from filesystem

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The jinja API document at pocoo.org states:

The simplest way to configure Jinja2 to load templates for your application looks roughly like this:

from jinja2 import Environment, PackageLoader
env = Environment(loader=PackageLoader("yourapplication", "templates"))

This will create a template environment with the default settings and a loader that looks up the templates in the templates folder inside the yourapplication python package.

As it turns out, this isn"t so simple because you have to make/install a python package with your templates in it, which introduces a lot of needless complexity, especially if you have no intention of distributing your code. You can refer to SO questions on the topic here and here, but the answers are vague and unsatisfying.

What a naive newbie wants to do, obviously, is just load the template directly from the filesystem, not as a resource in a package. How is this done?

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