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YAML parser that environment variable is expanded

Project description


$ pip install syaml

How to use it

A syaml is YAML parser that environment variable is expanded. It can use the path, name, here and environment variable in YAML file. It described in syntax of mako template. See .

A path is absolute path to YAML file, and name is file name of YAML file, and here is absolute directory path the YAML file stored.

For example.


- ${here}
- ${name}
- ${path}

The above file is equivalent to the following a file.

- /path/to/
- test.yaml
- /path/to/test.yaml

And, it can use environment variable in YAML file too.


- email: ${EMAIL}

If the environment variable EMAIL is set, the above file is equivalent to the following a file.

- email:

Load file and Load string

Example file /path/to/syaml/example.yml:

  - ${here}
  - ${name}
  - ${path}

Load file object:

>>> import syaml
>>> with open('example.yml', 'rb') as fp:
...     syaml.load(fp)
{'general': ['/path/to/syaml', 'example.yml', '/path/to/syaml/example.yml']}

Load byte string object:

>>> syaml.loads(b'general:\n  - ${here}\n  - ${name}\n  - ${path}\n')
{'general': ['', '', '']}

Load string object:

>>> syaml.loads('general:\n  - ${here}\n  - ${name}\n  - ${path}\n')
{'general': ['', '', '']}

name and path and here will replace to empty string If you passed a string to syaml.loads function. They are for a file object. A string like object don’t have file path.

Use command line tool

syaml render

It render the SAYML file.


  - ${here}
  - ${name}
  - ${path}

Execute syaml render command:

$ syaml render example.yml
- /path/to/syaml
- example.yml
- /path/to/syaml/example.yml

Execute syaml render command json style:

$ syaml render example.yml --json
{"general": ["/path/to/syaml", "example.yml", "/path/to/syaml/example.yml"]}

Execute syaml render command pre process only:

$ syaml render example.yml --pre
  - /path/to/syaml
  - example.yml
  - /path/to/syaml/example.yml


This section describes the tools and tips used when unittest. Run these tests with the following command:

$ python -m unittest discover src

If all tests pass, you will see the following output:

Ran 4 tests in 0.018s


The number of tests performed may be higher than described in this document.

Test with docker

Build docker image:

$ docker buildx build -t syaml .

Run test:

$ docker run -it --rm --workdir="/app" --volume "$(pwd):/app" --name="syaml" syaml tox

Release flow

  • Bump version. Edit setup.cfg file.

  • Generate distribution files. python -m build.

  • Check distribution files. twine check dist/*.
    • You need to make sure there are no “errors” displayed on the console.

  • Upload distribution files. twine upload dist/*.


Project details

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