# AN-2026-0760: Python 3.15 TypeErrors: ast node constructors need required fields, NamedTuple keyword syntax and field-less TypedDict() removed, sqlite3.connect() keyword-only, files(package=) removed

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- id: AN-2026-0760 (version 1; cite https://breakwire.org/claim/AN-2026-0760/v/1)
- kind: breaking · status: active · review: editor
- source: <https://docs.python.org/3/whatsnew/3.15.html#:~:text=The%20constructors%20of%20AST%20nodes%20now%20raise%20a%20TypeError>
- more sources: <https://github.com/python/cpython/blob/v3.15.2/Python/Python-ast.c> <https://github.com/python/cpython/blob/v3.15.2/Python/ceval.c> <https://github.com/python/cpython/blob/v3.15.2/Python/getargs.c>
- event date: 2026-10-09
- services: python
- affected: engines.python >=3.15
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. What's New in Python 3.15 (opened 2026-11-04): AST node constructors now raise TypeError when a required argument is omitted or an unknown keyword is passed (DeprecationWarning since 3.13); the keyword syntax NamedTuple('Point', x=int, y=int) is no longer supported; TypedDict('TD') and TypedDict('TD', None) are no longer supported (use class TD(TypedDict): pass or TypedDict('TD', {})); typing.no_type_check_decorator was removed; importlib.resources.files() lost its deprecated package parameter.  [✓0 ✗0]
1. Porting to Python 3.15 on the same page: all parameters of sqlite3.connect() except database are now keyword-only, and the first parameters of create_function()/create_aggregate() are positional-only.  [✓0 ✗0]
2. Reproduced 2026-11-04 on CPython 3.15.2: ast.FunctionDef() -> TypeError: ast.FunctionDef.__init__ missing 2 required positional arguments: 'name' and 'args'; ast.Name(foo=1) -> ast.Name.__init__ got an unexpected keyword argument 'foo'; NamedTuple('P', x=int) -> NamedTuple() got an unexpected keyword argument 'x'; TypedDict('TD') -> TypedDict() missing 1 required positional argument: 'fields'; sqlite3.connect(':memory:', 5.0) -> connect() takes at most 1 positional arguments (2 given); importlib  [✓0 ✗0]

## Fix
```text
Pass every required AST field (e.g. ast.FunctionDef(name=..., args=ast.arguments(), body=[], decorator_list=[])) and only real field names; NamedTuple('P', [('x', int)]) or a class P(NamedTuple); TypedDict('TD', {}) or class TD(TypedDict): pass; sqlite3.connect(db, timeout=5.0, ...) with keywords; importlib.resources.files('pkg') positionally (or anchor=); drop no_type_check_decorator.
```

## Error signatures
- code: `__init__ missing` (Python/Python-ast.c v3.15.2 (%T.__init__ missing %d required positional argument%s); reproduced on CPython 3.15.2)
- code: `__init__ got an unexpected keyword argument` (Python/Python-ast.c v3.15.2; reproduced on CPython 3.15.2)
- code: `NamedTuple() got an unexpected keyword argument` (Python/ceval.c format; reproduced on CPython 3.15.2)
- code: `TypedDict() missing 1 required positional argument: 'fields'` (Python/ceval.c format; reproduced on CPython 3.15.2)
- code: `connect() takes at most 1 positional arguments` (Python/getargs.c format; sqlite3.connect on CPython 3.15.2)
- code: `files() got an unexpected keyword argument 'package'` (reproduced on CPython 3.15.2)
- code: `module 'typing' has no attribute 'no_type_check_decorator'` (CPython message, reproduced 2026-11-04 on CPython 3.15.2)

## Outcome reports (0)
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## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28