How to format a python assert statement that complies with PEP8? Question: How does one format a long assert statement that complies with PEP8? Please ignore the contrived nature of my example. def afunc(some_param_name): assert isinstance(some_param_name, SomeClassName), ‘some_param_name must be an instance of SomeClassName, silly goose!’ One cannot wrap it in parenthesis, because that changes …
Unit Testing: Assert that a file/path exists Question: I am attempting to create a regression test for my Installer. The regression test is a script written in Python. The test checks that the correct files have been installed in the correct place. Is there a way to assert that a file/folder exists? I am getting …
design of python: why is assert a statement and not a function? Question: In Python, assert is a statement, and not a function. Was this a deliberate decision? Are there any advantages to having assert be a statement (and reserved word) instead of a function? According to the docs, assert expression1, expression2 is expanded to …
How to handle AssertionError in Python and find out which line or statement it occurred on? Question: I want to handle AssertionErrors both to hide unnecessary parts of the stack trace from the user and to print a message as to why the error occurred and what the user should do about it. Is there …
Why assert is not largely used? Question: I found that Python’s assert statement is a good way to catch situations that should never happen. And it can be removed by Python optimization when the code is trusted to be correct. It seems to be a perfect mechanism to run Python applications in debug mode. But …
Unittest's assertEqual and iterables – only check the contents Question: Is there a ‘decent’ way in unittest to check the equality of the contents of two iterable objects? I am using a lot of tuples, lists and numpy arrays and I usually only want to test for the contents and not for the type. Currently …
What is the use of "assert" in Python? Question: What does assert mean? How is it used? Asked By: Hossein || Source Answers: 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 …
How do I check (at runtime) if one class is a subclass of another? Question: Let’s say that I have a class Suit and four subclasses of suit: Heart, Spade, Diamond, Club. class Suit: … class Heart(Suit): … class Spade(Suit): … class Diamond(Suit): … class Club(Suit): … I have a method which receives a suit …
"assert" statement with or without parentheses Question: Here are four simple invocations of assert: >>> assert 1==2 Traceback (most recent call last): File “<stdin>”, line 1, in ? AssertionError >>> assert 1==2, “hi” Traceback (most recent call last): File “<stdin>”, line 1, in ? AssertionError: hi >>> assert(1==2) Traceback (most recent call last): File “<stdin>”, …
What are the advantages or difference in “assert False” and “self.assertFalse” Question: I am writing tests and I have heard some people saying to use self.assertFalse rather than assert False. Why is this and are there any advantages to be had? Asked By: chrisg || Source Answers: assert False throws an exception without useful logging …
