Skip to main content

A filter library for python

Project description


A filter library for python by Fabian Becker.

What for?

With a Filter object you can easily check for attributes of an object to equal a given value.


How to create a filter

Create a filter using init()

Both attributes are optional.

operator: str = "AND" ("AND" or "OR") sets the logical operator for the filter (checks all or any attributes).

allow_missing_attributes: bool = False sets the tolerance for missing attributes. If set to true it will skip if the attribute is missing in the object to check.

Create a filter from its representation

The return value of a filters __repr__ attribute can be used to store and later on recreate a filter using filter_from_repr

from filterlib import Filter, filter_from_repr

f = Filter()

print(f == filter_from_repr(repr(f)))
# f and filter_from_repr(f.__repr__()) is the same

Additional attributes

The attribute a filter checks for are variable

from filterlib import Filter
# Use the following systax:
f = Filter(<Optional[attibute name]><attributes magic method>=<value>)

# For example:
f = Filter(a__eq__=1)

# You can also use multiple attributes:
f = Filter(b__lte__=5,

# Or check for objects themselves
Filter(__eq__="Hello World!") == "Hello World!"

Use a filter

Make sure you use the filters __eq__ attribute.

# Make sure you use
Filter() == x
# instead of
x == Filter()


from filterlib import Filter
from typing import Optional

class Person:
    def __init__(self, 
                 name: str,
                 age: int,
                 best_friend: Optional[Person] = None): = name
        self.age = age
        self.best_fiend = best_friend

f = Filter(name__eq__="John")
p = Person(name="John", age=35)
print(f == p)
# True

f = Filter(name__ne__="John")
p = Person(name="John", age=35)
print(f == p)
# False

f = Filter(name__eq__="John", age__lte=40)
p = Person(name="John", age=35)
print(f == p)
# True

f = Filter(name__eq__="John", age__lte=20)
p = Person(name="John", age=35)
print(f == p)
# False

f = Filter(operator="OR",
p = Person(name="John", age=35)
print(f == p)
# True

p = Person(name="John",
f = Filter(best_friend__name__eq__="Thomas", 
print(f == p)
# True

SQL compatability

You can use filters for sql statements

from filterlib import Filter
import sqlite3

db = sqlite3.connect("myDB.sqlite")
db.execute("CREATE TABLE users(id, name)")
f = Filter(id__eq__=1)
db.execute(f"SELECT name FROM users WHERE {f}")

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for filterlib, version 0.1.3
Filename, size File type Python version Upload date Hashes
Filename, size filterlib-0.1.3.tar.gz (4.0 kB) File type Source Python version None Upload date Hashes View

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring DigiCert DigiCert EV certificate Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page