Python dependency specifications supporting logical operations

pip install dep-logic

This library requires Python 3.8 or later.

Currently, it contains two sub-modules:

• dep_logic.specifier - a module for parsing and calculating PEP 440 version specifiers.
• dep_logic.markers - a module for parsing and calculating PEP 508 environment markers.

This library allows logic operations on version specifiers and environment markers.

For example:

>>> from dep_logic.specifiers import parse_version_specifier >>> >>> a = parse_version_specifier(">=1.0.0") >>> b = parse_version_specifier("<2.0.0") >>> print(a & b) >=1.0.0,<2.0.0 >>> a = parse_version_specifier(">=1.0.0,<2.0.0") >>> b = parse_version_specifier(">1.5") >>> print(a | b) >=1.0.0

For markers:

>>> from dep_logic.markers import parse_marker >>> m1 = parse_marker("python_version < '3.8'") >>> m2 = parse_marker("python_version >= '3.6'") >>> print(m1 & m2) python_version < "3.8" and python_version >= "3.6"

This project is based on @sdispater's poetry-core code, but it includes additional packages and a lark parser, which increases the package size and makes it less reusable.

Furthermore, poetry-core does not always comply with PEP-508. As a result, this project aims to offer a lightweight utility for dependency specification logic using PyPA's packaging.

Submodules:

• dep_logic.specifiers - PEP 440 version specifiers
• dep_logic.markers - PEP 508 environment markers
• dep_logic.tags - PEP 425 platform tags

Logic operations with ===<string> specifiers is partially supported.