Illegal raise¶

ID: py/illegal-raise
Kind: problem
Security severity: 
Severity: error
Precision: very-high
Tags:
   - quality
   - reliability
   - error-handling
Query suites:
   - python-code-quality.qls
   - python-security-and-quality.qls

Click to see the query in the CodeQL repository

If the object raised is not a legal Exception class or an instance of one, then a TypeError will be raised instead.

Legal exception classes are:

Any old-style classes (Python 2 only)
Any subclass of the builtin class BaseException However, it recommended that you only use subclasses of the builtin class Exception (which is itself a subclass of BaseException).

Recommendation¶

Change the expression in the raise statement to be a legal exception.

Example¶

#Cannot raise an int, even if we want to
def raise_int():
    #Will raise a TypeError
    raise 4

References¶

Python Language Reference: Exceptions.
Python Tutorial: Handling Exceptions.

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