Python 3.12+astterm

ast.TypeVarTuple

type parameters

Node for a *Ts type parameter in square brackets (Python 3.12): name is a string, plus default_value since 3.13.

Syntax

ast.TypeVarTuple(name, default_value=None)

As with ParamSpec, the star is not part of name: *Ts gives name='Ts', and only the node class distinguishes it from a TypeVar. There is no bound field. A use of *Ts inside annotations parses as Starred, not as TypeVarTuple, so the declaration and its use look different in the tree.

Examples

import ast
f = ast.parse('def f[*Ts](*args: *Ts): ...').body[0]
tp = f.type_params[0]
print(type(tp).__name__, tp.name)  # → TypeVarTuple Ts
print(type(f.args.vararg.annotation).__name__)  # → Starred

See also

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