Comment by polyrand | Hacker News Reader

Comment by polyrand | Hacker News Reader

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Yes, I've used shiv and PEX in the past, and I love those. But that means "adding a build step". Also, as far as I understand, by default, those tools normally decompress the generated zip file on startup, but the decompressed artefacts have to be manually cleaned.

I think they are worth for more complex apps (I actually have a draft blog post with some experiments I did using PEX + gunicorn), but for my use case, it's not worth the effort when I only need the standard library.

You can try https://github.com/jaraco/pip-run or https://github.com/PyAr/fades (or eventually pipx: https://github.com/pypa/pipx/issues/913). They don't require a build step.

For example,

  #! /usr/bin/env -S pip-run Jinja2==3.*
  
  from jinja2 import Environment
  
  env = Environment(autoescape=True)
  template = env.from_string("Hello, {{ name }}!")
  print(template.render(name="world"))

There is a downside. Because pip-run recreates the virtualenv every time, the script takes a second to start up. pipx will cache virtualenvs once the single-file script feature is released. I haven't used fades yet.

Edit: fades caches virtualenvs.

  #! /usr/bin/env fades

  from jinja2 import Environment  # fades Jinja2==3.*

  env = Environment(autoescape=True)
  template = env.from_string("Hello, {{ name }}!")
  print(template.render(name="world"))

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