Web Reference: Literal types indicate that a variable has a specific and concrete value. For example, if we define some variable foo to have type Literal[3], we are declaring that foo must be exactly equal to 3 and no other value. Given some value v that is a member of type T, the type Literal[v] is a subtype of T. For example, Literal[3] is a subtype of int. 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. Jul 15, 2025 · Literals in Python are fixed values written directly in the code that represent constant data. They provide a way to store numbers, text, or other essential information that does not change during program execution.
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