Cette page n'est pas encore disponible en français, sa traduction est en cours. Si vous avez des questions ou des retours sur notre projet de traduction actuel, n'hésitez pas à nous contacter.
Metadata
ID:python-best-practices/invalid-assert
Language: Python
Severity: Notice
Category: Best Practices
Description
In Python, non-empty strings and non-empty tuples are considered True in a boolean context. Therefore, assert "Something bad happened" and assert (foo, bar) will always evaluate to True, even if foo and bar are False or None. This means that these assertions will never fail and are therefore invalid.
To avoid this, make sure that the expression after the assert keyword is a boolean expression that can evaluate to either True or False. For example, instead of assert "Something bad happened", you could use assert foo is not None, "Something bad happened". This will raise an AssertionError with the message “Something bad happened” if foo is None. Similarly, instead of assert (foo, bar), you could use assert foo == bar to check if foo and bar are equal.
Non-Compliant Code Examples
assert"Something bad happened"assert(foo,bar)
Compliant Code Examples
assertfoo==barassertbooleanValueassertportId.isnumeric(),"portId must be numeric"
Seamless integrations. Try Datadog Code Analysis
Datadog Code Analysis
Try this rule and analyze your code with Datadog Code Analysis
How to use this rule
1
2
rulesets:- python-best-practices # Rules to enforce Python best practices.
Create a static-analysis.datadog.yml with the content above at the root of your repository
Use our free IDE Plugins or add Code Analysis scans to your CI pipelines
