Best practice for lazy loading Python modules

Question

Occasionally I want lazy module loading in Python. Usually because I want to keep runtime requirements or start-up times low and splitting the code into sub-modules would be cum

Answer 1

class Handler(...):
    ...
    def render_with_jinja2(self, values, template_name):
        import jinja2
        env = jinja2.Environment(...)
        ...

There's no need to cache the imported module; Python does that already.