tag-expressions · Python Simple Repository Browser

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Author: Timo Furrer

Classifiers

Development Status

5 - Production/Stable

Environment

Console

License

OSI Approved :: GNU General Public License v3 or later (GPLv3+)

Operating System

MacOS :: MacOS X
POSIX
POSIX :: Linux

Programming Language

Python
Python :: 2
Python :: 2.7
Python :: 3
Python :: 3.3
Python :: 3.4
Python :: 3.5
Python :: 3.6
Python :: 3.7
Python :: 3.8
Python :: 3.9
Python :: 3.10
Python :: 3.11
Python :: 3.12
Python :: 3.13
Python :: Implementation
Python :: Implementation :: CPython
Python :: Implementation :: PyPy

Topic

Software Development :: Testing

Package to evaluate logical tag expressions by using a modified version of the Shunting Yard algorithm. This package is a Python port of cucumbers tag expression.

It’s also used by radish.

Installing

$ pip install tag-expressions

Here is a tease

>>> from tagexpressions import parse
>>>
>>> expression = '( a and b ) or ( c and d )'
>>> compiled_expression = parse(expression)
>>> print(compiled_expression)
( ( a and b ) or ( c and d ) )
>>>
>>> data = ['a', 'b', 'c', 'd']
>>> assert compiled_expression.evaluate(data) == True
>>>
>>> data = ['a', 'c']
>>> assert compiled_expression.evaluate(data) == False
>>>
>>>
>>> expression = 'not a or b and not c or not d or e and f'
>>> compiled_expression = parse(expression)
>>> print(compiled_expression)
( ( ( not ( a ) or ( b and not ( c ) ) ) or not ( d ) ) or ( e and f ) )
>>>
>>> data = ['b', 'e', 'f']
>>> assert compiled_expression.evaluate(data) == True
>>>
>>> data = ['a', 'c', 'd']
>>> assert compiled_expression.evaluate(data) == False