expandvars 0.1.6

Expand system variables Unix style

expandvars

Expand system variables Unix style

Inspiration

This module is inspired by GNU bash's variable expansion features. It can be used as an alternative to Python's os.path.expandvars function.

A good use case is reading config files with the flexibility of reading values from environment variables using advanced features like returning a default value if some variable is not defined. For example:

[default]
my_secret_access_code = "${ACCESS_CODE:-default_access_code}"

NOTE: Although it copies most of the common behaviours, it doesn't follow it strictly. For example, it doesn't work with arrays.

Usage

from expandvars import expandvars

print(expandvars("$PATH:$HOME/bin:${SOME_UNDEFINED_PATH:-/default/path}"))
# /bin:/sbin:/usr/bin:/usr/sbin:/home/you/bin:/default/path

Examples

For now, refer to the test cases to see how it behaves.

Contributing

To contribute, setup environment following way:

# Clone repo
git clone https://github.com/sayanarijit/expandvars && cd expandvars

# Create virtualenv
virtualenv .venv && source .venv/bin/activate

# Install project
pip install -e '.[testing]'

# Optional install black, ipython
pip install black ipython isort

• Follow general git guidelines.
• Keep it simple. Use black to format code.
• Keep it simple. Use isort to sort imports.