python-pie

Python-pie(python insert env) parses static files such as YAML and insert in them data from environment variables

• Getting Started
• Syntax example
• Using as module from command line
• Docker example
• Run tests

Getting Started

pip install python-pie

You can use python-pie to insert env variables to static configurations, like that:

from pie import process_file

filepath = '/docker/configuration.yaml'
process_file(filepath)

The syntax of files supported by python-pie is similar to that of python fstrings:

f"54 {from_env or 'default_value'} some text"

Depends if your environment has a from_env variable or not, python-pie will load it, or in case of absence take the default value

Syntax example

hosts:
  - f"{host}"

loglevel: 4
f"{'log_file_path'}": f"/file/path/{filename or 'tmp.log'}"
log_rotate_count: 1

after process_file(filepath)

hosts:
  - localohst

loglevel: 4
log_file_path: /file/path/tmp.log
log_rotate_count: 1

Using as module from command line

You can use python-pie in command line.

python -m pie -f /node54/config.yml

Flags: (you should provide at least one of those)

• -f --file path to config file.
• -s --string string to precess.

optional:

• -tf --to-file path to output config file.
• --keep-file if pie should keep original file without change.

Docker example

docker create -t --name pie -i python:3.9 || true;
docker start pie;
docker exec pie python -m pip install python-pie;
docker exec pie python -m pie -f /node54/config.yml;

during build:

FROM python:3.9-alpine AS builder
RUN pip install python-pie
RUN python -m pie -f /tmp/template.yml -tf /app/config.yml -e .env

Run tests

To run tests install pytest library and run the command:

pytest tests/