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Pylint 4.0.0-dev0 documentation
Pylint 4.0.0-dev0 documentation
  • Tutorial

User Guide

  • Installation
    • Command line installation
    • Editor and IDE integration
      • Using Pylint through Flymake in Emacs
      • Integrate Pylint with TextMate
    • Pre-commit integration
    • Installation with multiple interpreters
    • Show your usage
    • Upgrading pylint
  • Usage
    • Running Pylint
    • Pylint output
  • Messages
    • Messages overview
      • astroid-error / F0002
      • config-parse-error / F0011
      • fatal / F0001
      • method-check-failed / F0202
      • parse-error / F0010
      • old-import-error / F0401
        • import-error / E0401
      • abstract-class-instantiated / E0110
      • access-member-before-definition / E0203
      • assigning-non-slot / E0237
      • assignment-from-no-return / E1111
      • assignment-from-none / E1128
      • await-outside-async / E1142
      • bad-configuration-section / E0014
      • bad-except-order / E0701
      • bad-exception-cause / E0705
      • bad-format-character / E1300
      • bad-plugin-value / E0013
      • bad-reversed-sequence / E0111
      • bad-str-strip-call / E1310
      • bad-string-format-type / E1307
      • bad-super-call / E1003
      • bidirectional-unicode / E2502
      • broken-collections-callable / E6005
      • broken-noreturn / E6004
      • catching-non-exception / E0712
      • class-variable-slots-conflict / E0242
      • continue-in-finally / E0116
      • declare-non-slot / E0245
      • dict-iter-missing-items / E1141
      • duplicate-argument-name / E0108
      • duplicate-bases / E0241
      • format-needs-mapping / E1303
      • function-redefined / E0102
      • import-error / E0401
      • inconsistent-mro / E0240
      • inherit-non-class / E0239
      • init-is-generator / E0100
      • invalid-all-format / E0605
      • invalid-all-object / E0604
      • invalid-bool-returned / E0304
      • invalid-bytes-returned / E0308
      • invalid-character-backspace / E2510
      • invalid-character-carriage-return / E2511
      • invalid-character-esc / E2513
      • invalid-character-nul / E2514
      • invalid-character-sub / E2512
      • invalid-character-zero-width-space / E2515
      • invalid-class-object / E0243
      • invalid-enum-extension / E0244
      • invalid-envvar-value / E1507
      • invalid-field-call / E3701
      • invalid-format-returned / E0311
      • invalid-getnewargs-ex-returned / E0313
      • invalid-getnewargs-returned / E0312
      • invalid-hash-returned / E0309
      • invalid-index-returned / E0305
      • invalid-length-hint-returned / E0310
      • invalid-length-returned / E0303
      • invalid-metaclass / E1139
      • invalid-repr-returned / E0306
      • invalid-sequence-index / E1126
      • invalid-slice-index / E1127
      • invalid-slice-step / E1144
      • invalid-slots / E0238
      • invalid-slots-object / E0236
      • invalid-star-assignment-target / E0113
      • invalid-str-returned / E0307
      • invalid-unary-operand-type / E1130
      • invalid-unicode-codec / E2501
      • logging-format-truncated / E1201
      • logging-too-few-args / E1206
      • logging-too-many-args / E1205
      • logging-unsupported-format / E1200
      • method-hidden / E0202
      • misplaced-bare-raise / E0704
      • misplaced-format-function / E0119
      • missing-format-string-key / E1304
      • missing-kwoa / E1125
      • mixed-format-string / E1302
      • modified-iterating-dict / E4702
      • modified-iterating-set / E4703
      • no-member / E1101
      • no-method-argument / E0211
      • no-name-in-module / E0611
      • no-self-argument / E0213
      • no-value-for-parameter / E1120
      • non-iterator-returned / E0301
      • nonexistent-operator / E0107
      • nonlocal-and-global / E0115
      • nonlocal-without-binding / E0117
      • not-a-mapping / E1134
      • not-an-iterable / E1133
      • not-async-context-manager / E1701
      • not-callable / E1102
      • not-context-manager / E1129
      • not-in-loop / E0103
      • notimplemented-raised / E0711
      • positional-only-arguments-expected / E3102
      • possibly-used-before-assignment / E0606
      • potential-index-error / E0643
      • raising-bad-type / E0702
      • raising-non-exception / E0710
      • redundant-keyword-arg / E1124
      • relative-beyond-top-level / E0402
      • repeated-keyword / E1132
      • return-arg-in-generator / E0106
      • return-in-init / E0101
      • return-outside-function / E0104
      • singledispatch-method / E1519
      • singledispatchmethod-function / E1520
      • star-needs-assignment-target / E0114
      • syntax-error / E0001
      • too-few-format-args / E1306
      • too-many-format-args / E1305
      • too-many-function-args / E1121
      • too-many-star-expressions / E0112
      • truncated-format-string / E1301
      • undefined-all-variable / E0603
      • undefined-variable / E0602
      • unexpected-keyword-arg / E1123
      • unexpected-special-method-signature / E0302
      • unhashable-member / E1143
      • unpacking-non-sequence / E0633
      • unrecognized-inline-option / E0011
      • unrecognized-option / E0015
      • unsubscriptable-object / E1136
      • unsupported-assignment-operation / E1137
      • unsupported-binary-operation / E1131
      • unsupported-delete-operation / E1138
      • unsupported-membership-test / E1135
      • used-before-assignment / E0601
      • used-prior-global-declaration / E0118
      • yield-inside-async-function / E1700
      • yield-outside-function / E0105
      • bad-context-manager / E0235
        • unexpected-special-method-signature / E0302
      • bad-exception-context / E0703
        • bad-exception-cause / E0705
      • bad-option-value / E0012
        • useless-option-value / R0022
        • unknown-option-value / W0012
      • maybe-no-member / E1103
        • no-member / E1101
      • old-non-iterator-returned-2 / E0234
        • non-iterator-returned / E0301
      • old-unbalanced-tuple-unpacking / E0632
        • unbalanced-tuple-unpacking / W0632
      • unhashable-dict-key / E1140
        • unhashable-member / E1143
      • abstract-method / W0223
      • anomalous-backslash-in-string / W1401
      • anomalous-unicode-escape-in-string / W1402
      • arguments-differ / W0221
      • arguments-out-of-order / W1114
      • arguments-renamed / W0237
      • assert-on-string-literal / W0129
      • assert-on-tuple / W0199
      • attribute-defined-outside-init / W0201
      • bad-builtin / W0141
      • bad-chained-comparison / W3601
      • bad-dunder-name / W3201
      • bad-format-string / W1302
      • bad-format-string-key / W1300
      • bad-indentation / W0311
      • bad-open-mode / W1501
      • bad-staticmethod-argument / W0211
      • bad-thread-instantiation / W1506
      • bare-except / W0702
      • binary-op-exception / W0711
      • boolean-datetime / W1502
      • broad-exception-caught / W0718
      • broad-exception-raised / W0719
      • cell-var-from-loop / W0640
      • comparison-with-callable / W0143
      • confusing-with-statement / W0124
      • consider-ternary-expression / W0160
      • contextmanager-generator-missing-cleanup / W0135
      • dangerous-default-value / W0102
      • deprecated-argument / W4903
      • deprecated-attribute / W4906
      • deprecated-class / W4904
      • deprecated-decorator / W4905
      • deprecated-method / W4902
      • deprecated-module / W4901
      • deprecated-typing-alias / W6001
      • differing-param-doc / W9017
      • differing-type-doc / W9018
      • duplicate-except / W0705
      • duplicate-key / W0109
      • duplicate-string-formatting-argument / W1308
      • duplicate-value / W0130
      • eq-without-hash / W1641
      • eval-used / W0123
      • exec-used / W0122
      • expression-not-assigned / W0106
      • f-string-without-interpolation / W1309
      • fixme / W0511
      • forgotten-debug-statement / W1515
      • format-combined-specification / W1305
      • format-string-without-interpolation / W1310
      • global-at-module-level / W0604
      • global-statement / W0603
      • global-variable-not-assigned / W0602
      • global-variable-undefined / W0601
      • implicit-flag-alias / W0213
      • implicit-str-concat / W1404
      • import-self / W0406
      • inconsistent-quotes / W1405
      • invalid-envvar-default / W1508
      • invalid-format-index / W1307
      • invalid-overridden-method / W0236
      • isinstance-second-argument-not-valid-type / W1116
      • keyword-arg-before-vararg / W1113
      • kwarg-superseded-by-positional-arg / W1117
      • logging-format-interpolation / W1202
      • logging-fstring-interpolation / W1203
      • logging-not-lazy / W1201
      • lost-exception / W0150
      • method-cache-max-size-none / W1518
      • misplaced-future / W0410
      • missing-any-param-doc / W9021
      • missing-format-argument-key / W1303
      • missing-format-attribute / W1306
      • missing-param-doc / W9015
      • missing-parentheses-for-call-in-test / W0126
      • missing-raises-doc / W9006
      • missing-return-doc / W9011
      • missing-return-type-doc / W9012
      • missing-timeout / W3101
      • missing-type-doc / W9016
      • missing-yield-doc / W9013
      • missing-yield-type-doc / W9014
      • modified-iterating-list / W4701
      • multiple-constructor-doc / W9005
      • named-expr-without-context / W0131
      • nan-comparison / W0177
      • nested-min-max / W3301
      • non-ascii-file-name / W2402
      • non-parent-init-called / W0233
      • non-str-assignment-to-dunder-name / W1115
      • overlapping-except / W0714
      • overridden-final-method / W0239
      • pointless-exception-statement / W0133
      • pointless-statement / W0104
      • pointless-string-statement / W0105
      • possibly-unused-variable / W0641
      • preferred-module / W0407
      • protected-access / W0212
      • raise-missing-from / W0707
      • raising-format-tuple / W0715
      • redeclared-assigned-name / W0128
      • redefined-builtin / W0622
      • redefined-loop-name / W2901
      • redefined-outer-name / W0621
      • redefined-slots-in-subclass / W0244
      • redundant-returns-doc / W9008
      • redundant-u-string-prefix / W1406
      • redundant-unittest-assert / W1503
      • redundant-yields-doc / W9010
      • reimported / W0404
      • return-in-finally / W0134
      • self-assigning-variable / W0127
      • self-cls-assignment / W0642
      • shadowed-import / W0416
      • shallow-copy-environ / W1507
      • signature-differs / W0222
      • subclassed-final-class / W0240
      • subprocess-popen-preexec-fn / W1509
      • subprocess-run-check / W1510
      • super-init-not-called / W0231
      • super-without-brackets / W0245
      • too-many-try-statements / W0717
      • try-except-raise / W0706
      • unbalanced-dict-unpacking / W0644
      • unbalanced-tuple-unpacking / W0632
      • undefined-loop-variable / W0631
      • unknown-option-value / W0012
      • unnecessary-ellipsis / W2301
      • unnecessary-lambda / W0108
      • unnecessary-pass / W0107
      • unnecessary-semicolon / W0301
      • unreachable / W0101
      • unspecified-encoding / W1514
      • unused-argument / W0613
      • unused-format-string-argument / W1304
      • unused-format-string-key / W1301
      • unused-import / W0611
      • unused-private-member / W0238
      • unused-variable / W0612
      • unused-wildcard-import / W0614
      • useless-else-on-loop / W0120
      • useless-param-doc / W9019
      • useless-parent-delegation / W0246
      • useless-type-doc / W9020
      • useless-with-lock / W2101
      • using-assignment-expression-in-unsupported-version / W2605
      • using-constant-test / W0125
      • using-exception-groups-in-unsupported-version / W2603
      • using-f-string-in-unsupported-version / W2601
      • using-final-decorator-in-unsupported-version / W2602
      • using-generic-type-syntax-in-unsupported-version / W2604
      • using-positional-only-args-in-unsupported-version / W2606
      • while-used / W0149
      • wildcard-import / W0401
      • wrong-exception-operation / W0716
      • broad-except / W0703
        • broad-exception-caught / W0718
      • cache-max-size-none / W1517
        • method-cache-max-size-none / W1518
      • implicit-str-concat-in-sequence / W1403
        • implicit-str-concat / W1404
      • lru-cache-decorating-method / W1516
        • method-cache-max-size-none / W1518
      • old-assignment-from-none / W1111
        • assignment-from-none / E1128
      • old-deprecated-argument / W1511
        • deprecated-argument / W4903
      • old-deprecated-class / W1512
        • deprecated-class / W4904
      • old-deprecated-decorator / W1513
        • deprecated-decorator / W4905
      • old-deprecated-method / W1505
        • deprecated-method / W4902
      • old-deprecated-module / W0402
        • deprecated-module / W4901
      • old-empty-docstring / W0132
        • empty-docstring / C0112
      • old-missing-param-doc / W9003
        • missing-param-doc / W9015
      • old-missing-returns-doc / W9007
        • missing-return-doc / W9011
      • old-missing-type-doc / W9004
        • missing-type-doc / W9016
      • old-missing-yields-doc / W9009
        • missing-yield-doc / W9013
      • old-non-iterator-returned-1 / W0234
        • non-iterator-returned / E0301
      • old-unidiomatic-typecheck / W0154
        • unidiomatic-typecheck / C0123
      • old-unpacking-non-sequence / W0633
        • unpacking-non-sequence / E0633
      • useless-super-delegation / W0235
        • useless-parent-delegation / W0246
      • bad-classmethod-argument / C0202
      • bad-docstring-quotes / C0198
      • bad-file-encoding / C2503
      • bad-mcs-classmethod-argument / C0204
      • bad-mcs-method-argument / C0203
      • consider-iterating-dictionary / C0201
      • consider-using-any-or-all / C0501
      • consider-using-dict-items / C0206
      • consider-using-enumerate / C0200
      • consider-using-f-string / C0209
      • dict-init-mutate / C3401
      • disallowed-name / C0104
      • docstring-first-line-empty / C0199
      • empty-docstring / C0112
      • import-outside-toplevel / C0415
      • import-private-name / C2701
      • invalid-characters-in-docstring / C0403
      • invalid-name / C0103
      • line-too-long / C0301
      • misplaced-comparison-constant / C2201
      • missing-class-docstring / C0115
      • missing-final-newline / C0304
      • missing-function-docstring / C0116
      • missing-module-docstring / C0114
      • mixed-line-endings / C0327
      • multiple-imports / C0410
      • multiple-statements / C0321
      • non-ascii-module-import / C2403
      • non-ascii-name / C2401
      • single-string-used-for-slots / C0205
      • singleton-comparison / C0121
      • superfluous-parens / C0325
      • too-many-lines / C0302
      • trailing-newlines / C0305
      • trailing-whitespace / C0303
      • typevar-double-variance / C0131
      • typevar-name-incorrect-variance / C0105
      • typevar-name-mismatch / C0132
      • unexpected-line-ending-format / C0328
      • ungrouped-imports / C0412
      • unidiomatic-typecheck / C0123
      • unnecessary-direct-lambda-call / C3002
      • unnecessary-dunder-call / C2801
      • unnecessary-lambda-assignment / C3001
      • unnecessary-negation / C0117
      • use-implicit-booleaness-not-comparison / C1803
      • use-implicit-booleaness-not-comparison-to-string / C1804
      • use-implicit-booleaness-not-comparison-to-zero / C1805
      • use-implicit-booleaness-not-len / C1802
      • use-maxsplit-arg / C0207
      • use-sequence-for-iteration / C0208
      • useless-import-alias / C0414
      • wrong-import-order / C0411
      • wrong-import-position / C0413
      • wrong-spelling-in-comment / C0401
      • wrong-spelling-in-docstring / C0402
      • blacklisted-name / C0102
        • disallowed-name / C0104
      • compare-to-empty-string / C1901
        • use-implicit-booleaness-not-comparison-to-string / C1804
      • compare-to-zero / C2001
        • use-implicit-booleaness-not-comparison-to-zero / C1805
      • len-as-condition / C1801
        • use-implicit-booleaness-not-len / C1802
      • missing-docstring / C0111
        • missing-module-docstring / C0114
        • missing-class-docstring / C0115
        • missing-function-docstring / C0116
      • old-misplaced-comparison-constant / C0122
        • misplaced-comparison-constant / C2201
      • old-non-ascii-name / C0144
        • non-ascii-name / C2401
      • unneeded-not / C0113
        • unnecessary-negation / C0117
      • chained-comparison / R1716
      • comparison-of-constants / R0133
      • comparison-with-itself / R0124
      • condition-evals-to-constant / R1727
      • confusing-consecutive-elif / R5601
      • consider-alternative-union-syntax / R6003
      • consider-merging-isinstance / R1701
      • consider-refactoring-into-while-condition / R3501
      • consider-swap-variables / R1712
      • consider-using-alias / R6002
      • consider-using-assignment-expr / R6103
      • consider-using-augmented-assign / R6104
      • consider-using-dict-comprehension / R1717
      • consider-using-from-import / R0402
      • consider-using-generator / R1728
      • consider-using-get / R1715
      • consider-using-in / R1714
      • consider-using-join / R1713
      • consider-using-max-builtin / R1731
      • consider-using-min-builtin / R1730
      • consider-using-namedtuple-or-dataclass / R6101
      • consider-using-set-comprehension / R1718
      • consider-using-sys-exit / R1722
      • consider-using-ternary / R1706
      • consider-using-tuple / R6102
      • consider-using-with / R1732
      • cyclic-import / R0401
      • duplicate-code / R0801
      • else-if-used / R5501
      • empty-comment / R2044
      • inconsistent-return-statements / R1710
      • literal-comparison / R0123
      • magic-value-comparison / R2004
      • no-classmethod-decorator / R0202
      • no-else-break / R1723
      • no-else-continue / R1724
      • no-else-raise / R1720
      • no-else-return / R1705
      • no-self-use / R6301
      • no-staticmethod-decorator / R0203
      • prefer-typing-namedtuple / R6105
      • property-with-parameters / R0206
      • redefined-argument-from-local / R1704
      • redefined-variable-type / R0204
      • redundant-typehint-argument / R6006
      • simplifiable-condition / R1726
      • simplifiable-if-expression / R1719
      • simplifiable-if-statement / R1703
      • simplify-boolean-expression / R1709
      • stop-iteration-return / R1708
      • super-with-arguments / R1725
      • too-complex / R1260
      • too-few-public-methods / R0903
      • too-many-ancestors / R0901
      • too-many-arguments / R0913
      • too-many-boolean-expressions / R0916
      • too-many-branches / R0912
      • too-many-instance-attributes / R0902
      • too-many-locals / R0914
      • too-many-nested-blocks / R1702
      • too-many-positional-arguments / R0917
      • too-many-public-methods / R0904
      • too-many-return-statements / R0911
      • too-many-statements / R0915
      • trailing-comma-tuple / R1707
      • unnecessary-comprehension / R1721
      • unnecessary-default-type-args / R6007
      • unnecessary-dict-index-lookup / R1733
      • unnecessary-list-index-lookup / R1736
      • use-a-generator / R1729
      • use-dict-literal / R1735
      • use-list-literal / R1734
      • use-set-for-membership / R6201
      • use-yield-from / R1737
      • useless-object-inheritance / R0205
      • useless-option-value / R0022
      • useless-return / R1711
      • old-no-self-use / R0201
        • no-self-use / R6301
      • old-simplifiable-if-statement / R0102
        • simplifiable-if-statement / R1703
      • old-too-many-nested-blocks / R0101
        • too-many-nested-blocks / R1702
      • bad-inline-option / I0010
      • c-extension-no-member / I1101
      • deprecated-pragma / I0022
      • file-ignored / I0013
      • locally-disabled / I0011
      • raw-checker-failed / I0001
      • suppressed-message / I0020
      • use-symbolic-message-instead / I0023
      • useless-suppression / I0021
      • deprecated-disable-all / I0014
        • deprecated-pragma / I0022
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Changelog

  • 4.x
    • What's New in Pylint 4.0
  • 3.x
    • What's New in Pylint 3.3
    • What's New in Pylint 3.2
    • What's New in Pylint 3.1
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  • 2.x
    • What's New in Pylint 2.17
    • What's New in Pylint 2.16
    • What's New in Pylint 2.15
    • What's New in Pylint 2.14
      • Summary -- Release highlights
      • New checkers
      • Removed checkers
      • Extensions
      • Other Changes
      • Deprecations
      • Full changelog
    • What's New in Pylint 2.13
      • Summary -- Release highlights
      • New checkers
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      • Full changelog
    • What's New in Pylint 2.12
      • Summary -- Release highlights
      • New checkers
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      • Full changelog
    • What's New in Pylint 2.11
      • Summary -- Release highlights
      • New checkers
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      • Full changelog
    • What's New In Pylint 2.10
      • Summary -- Release highlights
      • New checkers
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      • Full changelog
    • What's New In Pylint 2.9
      • Summary -- Release highlights
      • New checkers
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      • Full changelog
    • What's New In Pylint 2.8
      • Summary -- Release highlights
      • Breaking changes
      • New checkers
      • Other Changes
      • Full changelog
    • What's New In Pylint 2.7
      • Summary -- Release highlights
      • New checkers
      • Other Changes
      • Full changelog
    • What's New In Pylint 2.6
      • Summary -- Release highlights
      • New checkers
      • Other Changes
      • Full changelog
    • What's New In Pylint 2.5
      • Summary -- Release highlights
      • New checkers
      • Other Changes
      • Full changelog
    • What's New In Pylint 2.4
      • Summary -- Release highlights
      • New checkers
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