assertify 2.0

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assertify

assertify -- assert (ver)ify -- is a Flexible, and Extendable python3.6+ library for boolean expressions, assertions, and verifications.

Key Features:

• Easy: Designed to make it easy to evaulate 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.
  • assertify_predicates: Is an extension of Assertify which allows for assertifying predicates. This is useful for validating variables or user input.
  • descriptify: Descriptify is a library that contians helpful python descriptors. It uses assertify_predicates to validate various descriptors.

Installation

pip install assertify

Example

Each Assertifier 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

Assertifiers

Comparison

Assertifier	Expression	raises
AssertifyEqual	first == second	ValueError
AsserifyNotEqual	first != Second	ValueError
AssertifyAlmostEqual	first ~ second	ValueError
AssertifyNotAlmostEqual	first !~ second	ValueError
AssertifyCountEqual	len(first) == len(second)	ValueError
AssertifyMultilineEqual	first.splitlines() == second.splitlines()	ValueError
AssertifySequenceEqual	seq1 == seq2	ValueError
AssertifyListEqual	list1 == list2	ValueError
AssertifyTupleEqual	tuple1 == tuple2	ValueError
AssertifySetEqual	set1 == set2	ValueError
AssertifyDictEqual	dict1 == dict2	ValueError
AssertifyLess	a < b	ValueError
AssertifyLessEqual	a <= b	ValueError
AssertifyGreater	a > b	ValueError
AssertifyGreater	a >= b	ValueError

Container

Assertifier	Expression	raises
AssertifyIn	member in container	ValueError
AssertifyNotIn	member not in container	ValueError

Control

Assertifier	Expression	raises
AssertifyRaises	excpected_exception	ValueError
AssertifyWarns	excpected_warning	ValueError
AssertifyLogs	logger(level)	ValueError

Identity

Assertifier	Expression	raises
AssertifyIs	exp1 is exp2	ValueError
AssertifyIsNot	exp1 is not exp2	ValueError
AssertifyIsNone	obj is None	ValueError
AssertifyIsNotNone	obj is not None	ValueError
AssertifyIsInstance	isinstance(obj,class)	TypeError
AssertifyIsInstances	isinstance(obj,cls) for cls in classes	TypeError
AssertifyIsNotInstance	not isinstance(obj,class)	TypeError
AssertifyIsNotInstances	not isinstance(obj,cls) for cls in classes	TypeError

Logic

Assertifier	Expression	raises
AssertifyTrue	expr	ValueError
AssertifyFalse	not expr	ValueError

Regex

Assertifier	Expression	raises
AssertifyRaisesRegex	expected_regex in expected_exception_message	ValueError
AssertifyWarnsRegex	expected_regex in expected_warning_message	ValueError
AssertifyRegex	text in expected_regex	ValueError
AssertifyNotRegex	text not in expected_regex	ValueError