This project provides a library for creating general purpose "Rule" objects from a logical expression which can then be applied to arbitrary objects to evaluate whether or not they match.
Project description
This project provides a library for creating general purpose “Rule” objects from a logical expression which can then be applied to arbitrary objects to evaluate whether or not they match.
Documentation is available at https://zeroSteiner.github.io/rule-engine/.
Rule Engine expressions are written in their own language, defined as strings in Python. Some features of this language includes:
Optional type hinting
Matching strings with regular expressions
Datetime datatypes
Data attributes
Example
The following example demonstrates the basic usage of defining a rule object and applying it to two dictionaries, showing that one matches while the other does not. See Getting Started for more information.
import rule_engine
# match a literal first name and applying a regex to the email
rule = rule_engine.Rule(
'first_name == "Luke" and email =~ ".*@rebels.org$"'
) # => <Rule text='first_name == "Luke" and email =~ ".*@rebels.org$"' >
rule.matches({
'first_name': 'Luke', 'last_name': 'Skywalker', 'email': 'luke@rebels.org'
}) # => True
rule.matches({
'first_name': 'Darth', 'last_name': 'Vader', 'email': 'dvader@empire.net'
}) # => FalseCredits
Spencer McIntyre - zeroSteiner (@zeroSteiner)
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