Python CodeQL queries for Code Quality

Explore the queries that CodeQL uses to analyze code quality for code written in Python.

Code Quality uses the following CodeQL queries to analyze Python code and detect code quality issues on:

Copilot Autofix suggestions are provided for findings where possible.

Query name Category Severity
'import *' may pollute namespace Maintainability Recommendation
Backspace escape in regular expression Maintainability Recommendation
Commented-out code Maintainability Recommendation
Comparison of constants Maintainability Warning
Comparison of identical values Maintainability Warning
Constant in conditional expression or statement Maintainability Warning
Duplicate key in dict literal Maintainability Warning
Duplication in regular expression character class Maintainability Warning
First parameter of a class method is not named 'cls' Maintainability Recommendation
First parameter of a method is not named 'self' Maintainability Recommendation
Implicit string concatenation in a list Maintainability Warning
Imprecise assert Maintainability Recommendation
Module imports itself Maintainability Recommendation
Module is imported more than once Maintainability Recommendation
Module is imported with 'import' and 'import from' Maintainability Recommendation
Nested loops with same variable Maintainability Recommendation
Overly complex __del__ method Maintainability Recommendation
Redundant comparison Maintainability Warning
Should use a 'with' statement Maintainability Recommendation
Statement has no effect Maintainability Recommendation
Unnecessary 'else' clause in loop Maintainability Warning
Unnecessary lambda Maintainability Recommendation
Unnecessary pass Maintainability Warning
Unreachable code Maintainability Warning
Unused argument in a formatting call Maintainability Warning
Unused global variable Maintainability Recommendation
Unused import Maintainability Recommendation
Unused local variable Maintainability Recommendation
Unused named argument in formatting call Maintainability Warning
Use of 'global' at module level Maintainability Warning
Use of the return value of a procedure Maintainability Warning
Variable defined multiple times Maintainability Warning
__del__ is called explicitly Reliability Warning
__eq__ not overridden when adding attributes Reliability Warning
__init__ method calls overridden method Reliability Warning
__init__ method is a generator Reliability Error
__init__ method returns a value Reliability Error
__iter__ method returns a non-iterator Reliability Error
An assert statement has a side-effect Reliability Error
Asserting a tuple Reliability Error
Comparison using is when operands support __eq__ Reliability Warning
Conflicting attributes in base classes Reliability Warning
Empty except Reliability Recommendation
Encoding error Reliability Error
Except block handles 'BaseException' Reliability Recommendation
Explicit export is not defined Reliability Error
Explicit returns mixed with implicit (fall through) returns Reliability Recommendation
File is not always closed Reliability Warning
First argument to super() is not enclosing class Reliability Error
Formatted object is not a mapping Reliability Error
Formatting string mixes implicitly and explicitly numbered fields Reliability Error
Illegal raise Reliability Error
Incomplete ordering Reliability Warning
Inconsistent equality and hashing Reliability Warning
Inconsistent equality and inequality Reliability Warning
Inconsistent method resolution order Reliability Error
Iterable can be either a string or a sequence Reliability Error
Iterator does not return self from __iter__ method Reliability Error
Loop variable capture Reliability Error
Maybe missing 'self' in comparison Reliability Warning
Membership test with a non-container Reliability Error
Mismatch between signature and use of an overridden method Reliability Recommendation
Mismatch between signature and use of an overriding method Reliability Error
Mismatch in multiple assignment Reliability Error
Missing call to superclass __del__ during object destruction Reliability Error
Missing call to superclass __init__ during object initialization Reliability Error
Missing named arguments in formatting call Reliability Error
Missing part of special group in regular expression Reliability Warning
Modification of dictionary returned by locals() Reliability Warning
Modification of parameter with default Reliability Error
Multiple calls to __del__ during object destruction Reliability Warning
Multiple calls to __init__ during object initialization Reliability Warning
Mutation of descriptor in __get__ or __set__ method Reliability Error
Nested loops with same variable reused after inner loop body Reliability Error
Non-callable called Reliability Error
Non-exception in 'except' clause Reliability Error
Non-iterable used in for loop Reliability Error
Non-standard exception raised in special method Reliability Recommendation
Raising NotImplemented Reliability Warning
Redundant assignment Reliability Error
Returning tuples with varying lengths Reliability Recommendation
Signature mismatch in overriding method Reliability Warning
Special method has incorrect signature Reliability Error
Superclass attribute shadows subclass method Reliability Error
Suspicious unused loop iteration variable Reliability Error
Syntax error Reliability Error
Testing equality to None Reliability Recommendation
Too few arguments in formatting call Reliability Error
Unhashable object hashed Reliability Error
Unmatchable caret in regular expression Reliability Error
Unmatchable dollar in regular expression Reliability Error
Unreachable except block Reliability Error
Unsupported format character Reliability Error
Unused exception object Reliability Error
Use of a print statement at module level Reliability Recommendation
Use of exit() or quit() Reliability Warning
Wrong name for an argument in a call Reliability Error
Wrong name for an argument in a class instantiation Reliability Error
Wrong number of arguments for format Reliability Error
Wrong number of arguments in a call Reliability Error
Wrong number of arguments in a class instantiation Reliability Error