| Rule | Description | KPI | URL |
|---|---|---|---|
| E0102-alreadyDefinedLine | Prohibits the redefinition of functions, classes and methods. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0105-yieldOutsideFunction | A yield statement is found outside a function or method. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0106-returnWithArgInsideGenerator | A return statement with an argument is found in a generator function or method (e.g. with some yield statements). | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0202-hiddenMethod | A class defines a method which is hidden by an instance attribute with the same name. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0203-accessToMethodBeforeDefinition | An instance member is accessed before it’s actually assigned. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0211-noArgumentInMethod | A method which should have the bound instance as first argument has no argument defined. | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0213-selfArgumentMissing | The first argument of a (instance) method has a name other than self. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0221-resolvedInterfaceIsNotClass | A class claims to implement an interface which is not a class. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0222-missingMethodFromInterface | A method declared in an interface is missing from a class implementing this interface. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E0501-noEncodingSpecified | Non-ASCII characters found but no encoding specified | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0502-wrongEncoding | Wrong encoding specified | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0503-unknownEncoding | Unknown encoding specified | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0601-localVarUserBeforeAssignment | Avoid using a local variable from being accessed before it’s actually assigned. | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0602-undefinedVariable | An undefined variable is accessed. | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0701-incorrectExceptClausesOrder | Except clauses are not in the correct order (from the more specific to the more generic). If you don’t fix the order, some exceptions may not be caught by the most specific handler. | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0711-notImplementedRaised | Avoid raising NotImplemented, NotImplementedError should be raised instead. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E1102-ObjectNotCallable | Avoid invocation of an object that has been inferred to a non-callable object. | Robustness | http://pylint-messages.wikidot.com/all-codes |
| E1111-incorrectAssignmentOfFunction | An assigment is done on a function call but the inferred function doesn’t return anything. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E1301-avoidPartialConversionInString | Avoid partial conversion specifiers from being used in string format operations. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E1304-missingKeyInFormatStringDictionary | Avoid mapping for format string operations of having undefined conversion specifiers. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E1306-insufficientArgForFormatString | A format string that uses unnamed conversion specifiers is given too few arguments | Understandability | http://pylint-messages.wikidot.com/all-codes |
| E9900-unsupportedFormatCharacter | A character with an unsupported format has been used. | Understandability | http://pylint-messages.wikidot.com/all-codes |
| W0702-noExceptionTypeSpecified | An except clause doesn’t specify exceptions type to catch. | Accuracy | http://pylint-messages.wikidot.com/all-codes |
| E0118-nameUsedBeforeDeclaration | Emitted when a name is used prior a global declaration, which results in an error since Python 3.6. | Understandability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0237-incorrectAssignmentForSlotClass | Used when assigning to an attribute not defined in the class slots. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0401-unableToImportModule | Used when pylint has been unable to import a module. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0632-tupleUnpackingUnbalancedTuple | Used when there is an unbalanced tuple unpacking in assignment | Robustness | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0633-attemptToUnpackNonSequence | Used when something which is not a sequence is used in an unpack assignment | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1129-contextManagerError | Used when an instance in a with statement doesn’t implement the context manager protocol(__enter__/__exit__). | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1130-invalidUnaryOperand | Emitted when a unary operand is used on an object which does not support this type of operation | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1131-unsupportedBinaryOperation | Emitted when a binary arithmetic operation between two operands is not supported. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1133-noniterableValueInIteratingContext | Used when a non-iterable value is used in place where iterable is expected | Robustness | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1134-nonMappingValueInIteratingContext | Used when a non-mapping value is used in place where mapping is expected | Robustness | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1135-membershipProtocolException | Emitted when an instance in membership test expression doesn’t implement membership protocol (__contains__/__iter__/__getitem__) | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1136-valueUnsubscriptable | Emitted when a subscripted value doesn’t support subscription(i.e. doesn’t define __getitem__ method) | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1137-itemAssignmentNotSupported | Emitted when an object does not support item assignment (i.e. doesn’t define __setitem__ method) | Accuracy | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1138-itemDeletionNotSupported | Emitted when an object does not support item deletion (i.e. doesn’t define __delitem__ method) | Accuracy | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1139-invalidMetaclassUsed | Emitted whenever we can detect that a class is using, as a metaclass, something which might be invalid for using as a metaclass. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1601-printStatementUsed | Used when a print statement is used (print is a function in Python 3) | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1602-parameterUnpackingSpecified | Used when parameter unpacking is specified for a function(Python 3 doesn’t allow it) | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1603-implicitUnpackingNotSupported | Python3 will not allow implicit unpacking of exceptions in except clauses. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1605-invalidOperatorUsed | Used when the deprecated ‘“’ (backtick) operator is used instead of the str() function | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1606-usedLongAsSuffix | Used when ‘l’ or ‘L’ is used to mark a long integer. This will not work in Python 3, since int and long types have merged. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1607-invalidNegationOperator | Used when the deprecated ‘<>’ operator is used instead of ‘!=’. This is removed in Python 3. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1608-oldOctalSyntaxUsed | Used when encountering the old octal syntax, removed in Python 3. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1610-notAsciiByteLiteralsNotSupported | Used when non-ascii bytes literals are found in a program. They are no longer supported in Python 3. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1701-asyncContextManagerProtocolNotImplemented | Used when an async context manager is used with an object that does not implement the async context management protocol. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| F0202-unableToCheckMethodSignature | Used when Pylint has been unable to check methods signature compatibility for an unexpected reason | Robustness | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0111-reversedArgumentNotSequenced | The first reversed() argument is not a sequence | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0113-incorrectStarredAssignment | Don’t unpack multiple values using a sole starred assignment target. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0114-useStarredExprInAssignmentTarget | Do not use a starred variable expression in other places than an assignment. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0115-nameIsNonlocalAndNonGlobal | Do not declare a variable as both nonlocal and global, only one can be picked. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0116-continueInFinallyNotSupported | Using continue in a finally statement is a SyntaxError. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0239-inheritingSomethingWhichIsNotAClass | Do not inherit from something which is not a class. | Understandability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0240-inconsistentMethodResolutionOrderForClass | Avoid defining a class for which a method resolution order could not be determined. | Accuracy | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0301-_iterReturnsNonIterator | _iter__ should always return an iterator, otherwise an error will occur. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0302-enforceCorrectSignatureForSpecialMethod | Enforce correct signature of special methods | Understandability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E0704-raiseNotInsideExceptClause | Do not place raise in other places than an except clause. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |
| E1126-sequenceIndexNotAnInt | Always index a sequence with an integer, a slice or an instance providing an __index__ method. | Maintainability | https://pylint.readthedocs.io/en/latest/technical_reference/features.html |