Code Generation with Jinja

generate.py

from jinja2 import Template, Environment

# The environment is used to configure the template engine
# See: http://jinja.pocoo.org/docs/dev/api/#jinja2.Environment
env = Environment(autoescape=False, optimized=False)

# Open your template and compile into a template object.
with open("template.txt", "r") as f:
  template = env.from_string(f.read())

# Render the template
with open("/path/to/output-file.txt", "w") as f:
  # Stream renders the template to a stream for writing to a file.
  # Pass your variables as kwargs
  template.stream(
    Host="localhost",
    IP="127.0.0.1",
    BT=[12, 12, 32]
  ).dump(f)
  

template.txt

Host: {{ Host }}
IP: {{ IP }}
{% for entry in BT %}
BT_{{ loop.index }}: {{ entry }}
{% endfor %}