.. py:module:: ethereum.utils.ensure

Ensure (Assertion) Utilities
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. contents:: Table of Contents
    :backlinks: none
    :local:

Introduction
------------

Functions that simplify checking assertions and raising exceptions.


.. only:: stage1

Module Contents
---------------


Functions
~~~~~~~~~

.. autoapisummary::
   :nosignatures:

   ethereum.utils.ensure.ensure



Module Details
---------------

ensure
~~~~~~


.. function:: ensure(value: bool, exception: Union[Type[BaseException], BaseException]) -> None
   :noindexentry:

   Does nothing if `value` is truthy, otherwise raises the exception returned
   by `exception_class`.

   :param value: Value that should be true.
   :param exception: Constructor for the exception to raise.




.. undocinclude:: /../src/ethereum/utils/ensure.py
   :language: python
   :pyobject: ensure