raise-literal (B016)

Derived from the flake8-bugbear linter.

What it does

Checks for raise statements that raise a literal value.

Why is this bad?

raise must be followed by an exception instance or an exception class, and exceptions must be instances of BaseException or a subclass thereof. Raising a literal will raise a TypeError at runtime.

Example

raise "foo"

Use instead:

raise Exception("foo")

References

• Python documentation: raise statement