eval_type_backport_pep604_union_syntax_older_python.py

1from typing import List, get_type_hints
2from eval_type_backport import eval_type_backport
3
4class MyClass:
5    # Uses the | operator (PEP 604) which is only native in Python 3.10+
6    data: "int | List[str]"
7
8# Evaluating the type hints manually using the backport
9hints = get_type_hints(MyClass, globalns=globals())
10# This would normally fail on Python < 3.10 without the backport logic, 
11# but eval_type_backport allows it to be parsed correctly.
12for name, typ in hints.items():
13    # In practice, many libraries use eval_type_backport internally, 
14    # but you can use it to evaluate a specific type object:
15    evaluated = eval_type_backport(typ)
16    print(f"{name}: {evaluated}")