raise_assert

A short way to check for conditions and raise if it fails, in Python.

Motivation

I get annoyed to need writing all the time variations around:

if not isinstance(my_bool, bool):
    raise ValueError("my_bool should be a bool")

And as pointed several places on the net, assert cannot really be trusted for performing this sort of checks, as asserts can be disabled with the -O flag, see for example: https://stackoverflow.com/questions/1273211/disable-assertions-in-python .

Solution

The raise_assert package contains a single function that allows writing:

from raise_assert import ras

ras(isinstance(my_bool, bool))

or, if you want an error message (but this is usually not needed, as the stack trace is usually explicit enough):

from raise_assert import ras

ras(isinstance(my_bool, bool), "my_bool must be a bool")

Installation

pip install raise_assert

Why ras?

The word ras is shortland for both raise_assert and 'rien à signaler', 'nothing to signal' in French.