assertify

assertify -- assert or (ver)ify -- is a Flexible, and Extendable python3.6+ library for evaluating an expression by returning False or raising an AssertionError or the given Exception if the expression is invalid.

Key Features:

• Easy: Designed to make it easy to evaluate an expression and return True/False or raise an AssertionError or Exception.
• Great Developer Experience: Being fully typed makes it great for editor support.
• There is More!!!:
  • unittest_assertions: Assertify is built on top of the unittest_assertions, which is a library that converts the assertions from unittest to standalone assertions.

Installation

pip install assertify

Example

raises an appropriate exception by default.

Exception Example

AssertifyIsInstance will raise a TypeError by default, but you can also specify any other type of exception.

from assertifiers.identity import AssertifyIsInstance

is_instance = AssertifyIsInstance()
is_instance("example str", int)  # raise TypeError("'example str' is not an instance of <class 'int'>")

Assertion Example

Specify AssertionError to be raised

from assertifiers.identity import AssertifyIsInstance

is_instance = AssertifyIsInstance(raises=AssertionError)
is_instance("example str", int)  # raise AssertionError("'example str' is not an instance of <class 'int'>")

Boolean Example

If raises=None assertify will return a Boolean.

from assertifiers.identity import AssertifyIsInstance

is_instance = AssertifyIsInstance(raises=None)
print(is_instance("example str", int))  # False

Predicate (Partial Function) Example

from functools import partial
from assertifiers.identity import AssertifyIsInstances

is_instance = AssertifyIsInstances(must_be_instance_of=any)
predicate_is_instance = partial(is_instance,classes=[int,float])
print(predicate_is_instance(obj=7.62)) # True

Assertifiers

Comparison

Container

Control

Identity

Logic

Regex