a little flow-based process engine implementation
Project description
Flow-based process just got Pythonic
dtree is a library for processing flow-based logical system with complicated chain of if-else blocks just like handling a flowchart.
Example
Here is a quick example to get a feeling of dtree. Given information of a student like
student = {
'age': 15,
'interest': 'reading',
'gender': 'female',
}
figure out what gift to give with the following logics:
+++root:
| +++age < 12:
| | +++interest = sports:
| | | ---gender = female --> give note
| | | ---ELSE --> give football
| | ---ELSE --> give book
| +++age >= 15:
| | ---interest = writing --> give note
| | ---ELSE --> give book
| +++ELSE:
| | ---gender = male --> give football
| | ---ELSE --> give book
from dtree import *
student = {
'age': 15,
'interest': 'reading',
'gender': 'female',
}
age = ValueGetter("age", lambda student: student['age'])
interest = ValueGetter("interest", lambda student: student['interest'])
gender = ValueGetter("gender", lambda student: student['gender'])
is_male = gender.eq("male")
is_female = gender.eq("female")
def give(item):
print("give %s" % item)
give_book = ToAction(lambda student: give("book"), "give book")
give_football = ToAction(lambda student: give("football"), "give football")
give_note = ToAction(lambda student: give("note"), "give note")
rule = DTree(Node(
(age.lt(12), Node(
(interest.eq("sports"), Node(
(is_female, give_note),
(else_, give_football),
)),
(else_, give_book),
)),
(age.ge(15), Node(
(interest.eq("writing"), give_note),
(else_, give_book),
)),
(else_, Node(
(is_male, give_football),
(else_, give_book),
)),
))
rule.run(student) # give book
Installation
Use pip <http://pip-installer.org>
_ or easy_install::
pip install dtree-python
Alternatively, you can just drop dtree.py
file into your project—it is
self-contained.
- dtree is tested with Python 2.6, 2.7, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7 and PyPy.
Project details
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