To improve the user experience understanding what part of the error messages associated with SyntaxErrors is wrong, we can highlight the whole error range and not only place the caret at the first character. In this way:
>>> foo(x, z for z in range(10), t, w)
File "<stdin>", line 1
foo(x, z for z in range(10), t, w)
^
SyntaxError: Generator expression must be parenthesized
becomes
>>> foo(x, z for z in range(10), t, w)
File "<stdin>", line 1
foo(x, z for z in range(10), t, w)
^^^^^^^^^^^^^^^^^^^^
SyntaxError: Generator expression must be parenthesized
The Python C API
================
The C API is divided into three sections:
1. ``Include/``
2. ``Include/cpython/``
3. ``Include/internal/``
Include: Limited API
====================
``Include/``, excluding the ``cpython`` and ``internal`` subdirectories,
contains the public Limited API (Application Programming Interface).
The Limited API is a subset of the C API, designed to guarantee ABI
stability across Python 3 versions, and is defined in :pep:`384`.
Guidelines for expanding the Limited API:
- Functions *must not* steal references
- Functions *must not* return borrowed references
- Functions returning references *must* return a strong reference
- Macros should not expose implementation details
- Please start a public discussion before expanding the API
- Functions or macros with a ``_Py`` prefix do not belong in ``Include/``.
It is possible to add a function or macro to the Limited API from a
given Python version. For example, to add a function to the Limited API
from Python 3.10 and onwards, wrap it with
``#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000``.
Include/cpython: CPython implementation details
===============================================
``Include/cpython/`` contains the public API that is excluded from the
Limited API and the Stable ABI.
Guidelines for expanding the public API:
- Functions *must not* steal references
- Functions *must not* return borrowed references
- Functions returning references *must* return a strong reference
Include/internal: The internal API
==================================
With PyAPI_FUNC or PyAPI_DATA
-----------------------------
Functions or structures in ``Include/internal/`` defined with
``PyAPI_FUNC`` or ``PyAPI_DATA`` are internal functions which are
exposed only for specific use cases like debuggers and profilers.
With the extern keyword
-----------------------
Functions in ``Include/internal/`` defined with the ``extern`` keyword
*must not and can not* be used outside the CPython code base. Only
built-in stdlib extensions (built with the ``Py_BUILD_CORE_BUILTIN``
macro defined) can use such functions.
When in doubt, new internal C functions should be defined in
``Include/internal`` using the ``extern`` keyword.
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