jinja2 erb style __main__

__main__.py

# -*- coding: utf-8 -*-
"""
    jinja2.__main__
    ~~~~~~~~~~~~~~~

    Allows for simple rendering in the style of eRuby, accepting variables from
    the environment.

    :copyright: (c) 2015 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
"""

import os
import sys
from jinja2.environment import Environment
from jinja2.loaders import FileSystemLoader

if len(sys.argv) < 2:
    raise Exception("Run like: my_variable=Arnold python -m jinja2 my_template.jinja")

template_file = sys.argv[1]

loader = FileSystemLoader(searchpath=os.getcwd())
template_env = Environment(loader=loader)
template = template_env.get_template(template_file)
output = template.render(os.environ)

print(output)