Python object index for fast, declarative retrieval
Project description
odex
Python object index for fast, declarative retrieval.
Install
pip install odex
Usage
Odex provides a set-like collection called IndexedSet
:
from odex import IndexedSet, HashIndex, attr, and_
class X:
def __init__(self, a, b):
self.a = a
self.b = b
objs = [
X(a=1, b=4),
X(a=2, b=5),
X(a=2, b=6),
X(a=3, b=7),
]
iset = IndexedSet(objs, indexes=[HashIndex("a")])
# Filter objects with SQL-like expressions:
assert iset.filter("a = 2 AND b = 5") == {objs[1]}
# Or, using the fluent interface:
assert iset.filter(
and_(
attr("a").eq(2),
attr("b").eq(5)
)
) == {objs[1]}
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