Web Reference: Types like Literal[] or Literal are illegal. This section describes what exactly constitutes a legal Literal[...] type: what values may and may not be used as parameters. In short, a Literal[...] type may be parameterized by one or more literal expressions, and nothing else. Apr 6, 2025 · typing.Literal is a type hint introduced in Python 3.8 that allows you to specify that a variable or function parameter can only take on a specific set of literal values. These literal values can be integers, strings, booleans, or other immutable types. Oct 4, 2021 · If a function argument is annotated using Literal, you can only pass one of the provided literals in order to pass the type check. You can't assign one of the provided literals to a variable and pass that variable to the function.
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