Tag: assert

Why does python unittest assertRaises method not register exceptions that are thrown?

assert python python-unittest unit-testing valueerror

I have a problem similar to this post, however the solution doesn’t help me as I only pass one argument to the function. I have the following code: which I test using the python unittest module. However, even when my exceptions are raised, the assertions fail. When I run this, the traceback is: As you can see, it printed pass

Is the Python assert message evaluated if the assertion passes

assert assertion python

Let’s say I have an assert statement with a computationally heavy error message (e.g. makes several network or database calls). I could also write this code using an if statement: I know the latter option will only evaluate the error message if x != 5. What about the former option? I would assume so but I’m not sure. Answer No,

What is the use of “assert” in Python?

assert assertion exception python

What does assert mean? How is it used? Answer The assert statement exists in almost every programming language. It has two main uses: It helps detect problems early in your program, where the cause is clear, rather than later when some other operation fails. A type error in Python, for example, can go through several layers of code before actually

“assert” statement with or without parentheses

assert parentheses pep8 python statements

Here are four simple invocations of assert: Note that the last one does not raise an error. What is the difference between calling assert with or without parenthesis that causes this behavior? My practice is to use parenthesis, but the above suggests that I should not. Answer The last assert would have given you a warning (SyntaxWarning: assertion is always