Pylint Typecheck Messages to Pyrefly

Pylint is a linter, but its typecheck checker reports many of the same problems as a type checker, such as missing attributes and bad call arguments. If you use Pyrefly, you can usually disable these Pylint messages and rely on the corresponding Pyrefly error kinds instead.

There is no automatic migration from Pylint. Use the table below to find the Pyrefly error kind to configure or suppress in place of each Pylint message. For example, # pylint: disable=no-member corresponds to # pyrefly: ignore[missing-attribute].

How to read the table

The Enabled by column shows which presets report each Pyrefly error kind:

• basic: every preset except off. This includes the basic preset, which Pyrefly uses when it finds no configuration.
• default: every preset except off and basic.
• strict: only the strict and all presets. These error kinds are off by default.

You can also turn individual error kinds on or off with the errors setting.

Complete mapping

The mapping was checked by running Pyrefly on the example code from each message's page in the Pylint documentation.

Pylint message	Pyrefly error kind(s)	Enabled by	Notes
E1101 no-member	missing-attribute	default
I1101 c-extension-no-member	missing-attribute	default	Pyrefly reads type stubs for compiled modules rather than introspecting them, so it reports missing members of C extensions like any other module.
E1102 not-callable	not-callable	default
E1111 assignment-from-no-return	None		Pyrefly allows assigning a None result. Invalid uses of the assigned value are reported where they happen.
E1120 no-value-for-parameter	missing-argument	default
E1121 too-many-function-args	bad-argument-count	default
E1123 unexpected-keyword-arg	unexpected-keyword	basic
E1124 redundant-keyword-arg	bad-keyword-argument	basic
E1125 missing-kwoa	missing-argument	default
E1126 invalid-sequence-index	bad-index	default
E1127 invalid-slice-index	bad-index	default
E1128 assignment-from-none	None		Same as assignment-from-no-return.
E1129 not-context-manager	bad-context-manager	default
E1145 async-context-manager-with-regular-with	bad-context-manager	default
E1130 invalid-unary-operand-type	unsupported-operation	default
E1131 unsupported-binary-operation	unsupported-operation	default
E1132 repeated-keyword	bad-keyword-argument, potential-bad-keyword-argument	basic, strict	Pyrefly reports bad-keyword-argument when the repeated keyword is a required key of an unpacked TypedDict. Pylint's examples unpack dictionary literals, which Pyrefly reports as potential-bad-keyword-argument. That error kind is off by default.
E1133 not-an-iterable	not-iterable	default
E1134 not-a-mapping	bad-unpacking	basic
E1135 unsupported-membership-test	not-iterable	default
E1136 unsubscriptable-object	bad-index	default
E1137 unsupported-assignment-operation	unsupported-operation	default
E1138 unsupported-delete-operation	unsupported-operation	default
E1139 invalid-metaclass	invalid-inheritance	default
E1141 dict-iter-missing-items	None		Pyrefly only reports this when the dictionary's key type cannot be unpacked, for example not-iterable for int keys. String keys are iterable.
E1142 await-outside-async	invalid-syntax	basic
E1143 unhashable-member	None		Pyrefly does not check that dictionary keys and set members are hashable. It reports bad-index if the key does not match the dictionary's key type.
E1144 invalid-slice-step	bad-index	default
W1113 keyword-arg-before-vararg	None		This is a style check, and the signature is valid.
W1114 arguments-out-of-order	None		This is a heuristic based on argument names, and the call is valid.
W1115 non-str-assignment-to-dunder-name	bad-assignment	default
W1116 isinstance-second-argument-not-valid-type	invalid-argument	default
W1117 kwarg-superseded-by-positional-arg	None		The call is valid, because the keyword argument goes into **kwargs.