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Pylint 4.0.0-dev0 documentation

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Pylint 4.0.0-dev0 documentation

Tutorial

User Guide

Installation
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- Command line installation
- Editor and IDE integration
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  - Using Pylint through Flymake in Emacs
  - Integrate Pylint with TextMate
- Pre-commit integration
- Installation with multiple interpreters
- Show your usage
- Upgrading pylint
Usage
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- Running Pylint
- Pylint output
Messages
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- Messages overview
  Toggle navigation of Messages overview
  - astroid-error / F0002
  - config-parse-error / F0011
  - fatal / F0001
  - method-check-failed / F0202
  - parse-error / F0010
  - old-import-error / F0401
    Toggle navigation of 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
    Toggle navigation of bad-context-manager / E0235
    - unexpected-special-method-signature / E0302
  - bad-exception-context / E0703
    Toggle navigation of bad-exception-context / E0703
    - bad-exception-cause / E0705
  - bad-option-value / E0012
    Toggle navigation of bad-option-value / E0012
    - useless-option-value / R0022
    - unknown-option-value / W0012
  - maybe-no-member / E1103
    Toggle navigation of maybe-no-member / E1103
    - no-member / E1101
  - old-non-iterator-returned-2 / E0234
    Toggle navigation of old-non-iterator-returned-2 / E0234
    - non-iterator-returned / E0301
  - old-unbalanced-tuple-unpacking / E0632
    Toggle navigation of old-unbalanced-tuple-unpacking / E0632
    - unbalanced-tuple-unpacking / W0632
  - unhashable-dict-key / E1140
    Toggle navigation of 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
    Toggle navigation of broad-except / W0703
    - broad-exception-caught / W0718
  - cache-max-size-none / W1517
    Toggle navigation of cache-max-size-none / W1517
    - method-cache-max-size-none / W1518
  - implicit-str-concat-in-sequence / W1403
    Toggle navigation of implicit-str-concat-in-sequence / W1403
    - implicit-str-concat / W1404
  - lru-cache-decorating-method / W1516
    Toggle navigation of lru-cache-decorating-method / W1516
    - method-cache-max-size-none / W1518
  - old-assignment-from-none / W1111
    Toggle navigation of old-assignment-from-none / W1111
    - assignment-from-none / E1128
  - old-deprecated-argument / W1511
    Toggle navigation of old-deprecated-argument / W1511
    - deprecated-argument / W4903
  - old-deprecated-class / W1512
    Toggle navigation of old-deprecated-class / W1512
    - deprecated-class / W4904
  - old-deprecated-decorator / W1513
    Toggle navigation of old-deprecated-decorator / W1513
    - deprecated-decorator / W4905
  - old-deprecated-method / W1505
    Toggle navigation of old-deprecated-method / W1505
    - deprecated-method / W4902
  - old-deprecated-module / W0402
    Toggle navigation of old-deprecated-module / W0402
    - deprecated-module / W4901
  - old-empty-docstring / W0132
    Toggle navigation of old-empty-docstring / W0132
    - empty-docstring / C0112
  - old-missing-param-doc / W9003
    Toggle navigation of old-missing-param-doc / W9003
    - missing-param-doc / W9015
  - old-missing-returns-doc / W9007
    Toggle navigation of old-missing-returns-doc / W9007
    - missing-return-doc / W9011
  - old-missing-type-doc / W9004
    Toggle navigation of old-missing-type-doc / W9004
    - missing-type-doc / W9016
  - old-missing-yields-doc / W9009
    Toggle navigation of old-missing-yields-doc / W9009
    - missing-yield-doc / W9013
  - old-non-iterator-returned-1 / W0234
    Toggle navigation of old-non-iterator-returned-1 / W0234
    - non-iterator-returned / E0301
  - old-unidiomatic-typecheck / W0154
    Toggle navigation of old-unidiomatic-typecheck / W0154
    - unidiomatic-typecheck / C0123
  - old-unpacking-non-sequence / W0633
    Toggle navigation of old-unpacking-non-sequence / W0633
    - unpacking-non-sequence / E0633
  - useless-super-delegation / W0235
    Toggle navigation of 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
    Toggle navigation of blacklisted-name / C0102
    - disallowed-name / C0104
  - compare-to-empty-string / C1901
    Toggle navigation of compare-to-empty-string / C1901
    - use-implicit-booleaness-not-comparison-to-string / C1804
  - compare-to-zero / C2001
    Toggle navigation of compare-to-zero / C2001
    - use-implicit-booleaness-not-comparison-to-zero / C1805
  - len-as-condition / C1801
    Toggle navigation of len-as-condition / C1801
    - use-implicit-booleaness-not-len / C1802
  - missing-docstring / C0111
    Toggle navigation of missing-docstring / C0111
  - old-misplaced-comparison-constant / C0122
    Toggle navigation of old-misplaced-comparison-constant / C0122
    - misplaced-comparison-constant / C2201
  - old-non-ascii-name / C0144
    Toggle navigation of old-non-ascii-name / C0144
    - non-ascii-name / C2401
  - unneeded-not / C0113
    Toggle navigation of unneeded-not / C0113
    - unnecessary-negation / C0117
  - chained-comparison / R1716
  - comparison-of-constants / R0133
  - comparison-with-itself / R0124
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  - 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
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  - simplifiable-condition / R1726
  - simplifiable-if-expression / R1719
  - simplifiable-if-statement / R1703
  - simplify-boolean-expression / R1709
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  - 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
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  - use-list-literal / R1734
  - use-set-for-membership / R6201
  - use-yield-from / R1737
  - useless-object-inheritance / R0205
  - useless-option-value / R0022
  - useless-return / R1711
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    Toggle navigation of old-no-self-use / R0201
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    Toggle navigation of old-simplifiable-if-statement / R0102
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    Toggle navigation of old-too-many-nested-blocks / R0101
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  - file-ignored / I0013
  - locally-disabled / I0011
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    Toggle navigation of deprecated-disable-all / I0014
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old-unpacking-non-sequence / W0633¶

'old-unpacking-non-sequence' has been renamed. The new message can be found at:

unpacking-non-sequence / E0633

useless-super-delegation / W0235

unidiomatic-typecheck / C0123

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Last updated on Oct 09, 2024