Answer by tbrugere for Best practice for using assert?
I'd add I often use assert to specify properties such as loop invariants or logical properties my code should have, much like I'd specify them in formally-verified software.They serve both the purpose...
View ArticleAnswer by Dirk Herrmann for Best practice for using assert?
Both the use of assert and the raising of exceptions are about communication.Assertions are statements about the correctness of code addressed at developers: An assertion in the code informs readers of...
View ArticleAnswer by Tomasz Gandor for Best practice for using assert?
Well, this is an open question, and I have two aspects that I want to touch on: when to add assertions and how to write the error messages.PurposeTo explain it to a beginner - assertions are statements...
View ArticleAnswer by Emilio M Bumachar for Best practice for using assert?
For what it's worth, if you're dealing with code which relies on assert to function properly, then adding the following code will ensure that asserts are enabled:try: assert False raise...
View ArticleAnswer by Antti Haapala -- СлаваУкраїні for Best practice for using assert?
The English language word assert here is used in the sense of swear, affirm, avow. It doesn't mean "check" or "should be". It means that you as a coder are making a sworn statement here:# I solemnly...
View ArticleAnswer by akD for Best practice for using assert?
An Assert is to check -1. the valid condition,2. the valid statement,3. true logic;of source code. Instead of failing the whole project it gives an alarm that something is not appropriate in your...
View ArticleAnswer by den.run.ai for Best practice for using assert?
In IDE's such as PTVS, PyCharm, Wing assert isinstance() statements can be used to enable code completion for some unclear objects.
View ArticleAnswer by Lutz Prechelt for Best practice for using assert?
Is there a performance issue?Please remember to "make it work first before you make it work fast".Very few percent of any program are usually relevant for its speed.You can always kick out or simplify...
View ArticleAnswer by Lutz Prechelt for Best practice for using assert?
The four purposes of assertAssume you work on 200,000 lines of code with four colleagues Alice, Bernd, Carl, and Daphne.They call your code, you call their code.Then assert has four roles:Inform Alice,...
View ArticleAnswer by matts1 for Best practice for using assert?
As has been said previously, assertions should be used when your code SHOULD NOT ever reach a point, meaning there is a bug there. Probably the most useful reason I can see to use an assertion is an...
View ArticleAnswer by outis for Best practice for using assert?
In addition to the other answers, asserts themselves throw exceptions, but only AssertionErrors. From a utilitarian standpoint, assertions aren't suitable for when you need fine grain control over...
View ArticleAnswer by John Mee for Best practice for using assert?
"assert" statements are removed when the compilation is optimized. So, yes, there are both performance and functional differences.The current code generator emits no code for an assert statement when...
View ArticleAnswer by Deestan for Best practice for using assert?
Asserts should be used to test conditions that should never happen. The purpose is to crash early in the case of a corrupt program state.Exceptions should be used for errors that can conceivably...
View ArticleAnswer by Jason Baker for Best practice for using assert?
The only thing that's really wrong with this approach is that it's hard to make a very descriptive exception using assert statements. If you're looking for the simpler syntax, remember you can also do...
View ArticleAnswer by Nadia Alramli for Best practice for using assert?
To be able to automatically throw an error when x become less than zero throughout the function. You can use class descriptors. Here is an example:class LessThanZeroException(Exception): passclass...
View ArticleBest practice for using assert?
Is there a performance or code maintenance issue with using assert as part of the standard code instead of using it just for debugging purposes?Isassert x >= 0, 'x is less than zero'better or worse...
View ArticleAnswer by Lutz Prechelt for Best practice for using assert?
Set a business rule like if x < 0 raise errorAs far as I am aware, there is no general (implementation-independent) solution for this.If, however, x is an attribute of the objects of some class C,...
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