[jseop-lim]

Description

Fixes #1259

The types of csv.reader() and csv.writer() objects were named after their module attributes, so they reported themselves as _csv.Reader and _csv.Writer. CPython names them _csv.reader and _csv.writer (_csv.c#L1055, #L1508) and adds them to the module as Reader and Writer (#L1752-L1762).

AS-IS

>>> type(csv.reader([]))
<class '_csv.Reader'>
>>> type(csv.writer(io.StringIO()))
<class '_csv.Writer'>

TO-BE

>>> type(csv.reader([]))
<class '_csv.reader'>
>>> type(csv.writer(io.StringIO()))
<class '_csv.writer'>
>>> type(csv.reader([])) is _csv.Reader
True

(matching CPython)

Changes

• Name PythonBuiltinClassType.CSVReader and CSVWriter reader and writer, with moduleName("_csv") instead of publishInModule("_csv"), which would shadow the reader() and writer() functions.
• Add the Reader and Writer aliases in CSVModuleBuiltins.initialize, as SocketModuleBuiltins does for SocketType.
• Add test_reader_writer_type_names to tests/test_csv.py.

Testing

mx python-jvm on darwin-aarch64, then mx graalpytest test_csv.py (6 passed). test.test_csv from lib-python passes (117 passed, same as master). The new test fails on the unpatched build. Type names, __module__, alias identity and dir(_csv) now print the same as CPython 3.13.14.