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TASK OBJECTIVE

astropy/astropy

How do you add header_rows support to Astropy's ascii.rst writer and RST.__init__?

TypeErrorPython traceback repairs

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01

TASK STATEMENT

verbatim agent-facing issue statement

Please support header rows in RestructuredText output
### Description

It would be great if the following would work:

```Python
>>> from astropy.table import QTable
>>> import astropy.units as u
>>> import sys
>>> tbl = QTable({'wave': [350,950]*u.nm, 'response': [0.7, 1.2]*u.count})
>>> tbl.write(sys.stdout,  format="ascii.rst")
===== ========
 wave response
===== ========
350.0      0.7
950.0      1.2
===== ========
>>> tbl.write(sys.stdout,  format="ascii.fixed_width", header_rows=["name", "unit"])
|  wave | response |
|    nm |       ct |
| 350.0 |      0.7 |
| 950.0 |      1.2 |
>>> tbl.write(sys.stdout,  format="ascii.rst", header_rows=["name", "unit"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/astropy/table/connect.py", line 129, in __call__
    self.registry.write(instance, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/astropy/io/registry/core.py", line 369, in write
    return writer(data, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/astropy/io/ascii/connect.py", line 26, in io_write
    return write(table, filename, **kwargs)
  File "/usr/lib/python3/dist-packages/astropy/io/ascii/ui.py", line 856, in write
    writer = get_writer(Writer=Writer, fast_writer=fast_writer, **kwargs)
  File "/usr/lib/python3/dist-packages/astropy/io/ascii/ui.py", line 800, in get_writer
    writer = core._get_writer(Writer, fast_writer, **kwargs)
  File "/usr/lib/python3/dist-packages/astropy/io/ascii/core.py", line 1719, in _get_writer
    writer = Writer(**writer_kwargs)
TypeError: RST.__init__() got an unexpected keyword argument 'header_rows'
```


### Additional context

RestructuredText output is a great way to fill autogenerated documentation with content, so having this flexible makes the life easier `:-)`

Match evidence

Primary terms

TypeErrorRST.__init__astropy/table/connect.pyastropy/astropyheader_rowsformat="ascii.rst"format="ascii.fixed_width"QTableastropy.unitsTypeError: RST.__init__() got an unexpected keyword argument 'header_rows'_get_writerget_writer

Technical objective

Make astropy's reStructuredText ASCII writer accept the header_rows option that the ascii.fixed_width writer already accepts, and render the requested extra header lines in a valid RST simple table.

Success condition

tbl.write(sys.stdout, format="ascii.rst", header_rows=["name", "unit"]) completes and emits a well-formed RST simple table that carries the additional header line(s), while tbl.write(sys.stdout, format="ascii.rst") with no header_rows keeps producing exactly the output shown in the report. The change must go through the normal writer-construction path (astropy.io.ascii writer registry), not a caller-side workaround.

Search fingerprints

  • Error signature: TypeError
  • Traceback path: astropy/table/connect.py
  • Repository: astropy/astropy
  • Option / API: header_rows, format="ascii.rst", format="ascii.fixed_width", QTable, astropy.units
  • Error string: TypeError: RST.__init__() got an unexpected keyword argument 'header_rows'
  • Symbols: RST.__init__, _get_writer, get_writer, io_write, self.registry.write
  • Files in the traceback: astropy/table/connect.py, astropy/io/registry/core.py, astropy/io/ascii/connect.py, astropy/io/ascii/ui.py, astropy/io/ascii/core.py
  • Rendered artifacts: the ===== ======== / wave response RST rule-and-header block, and the | wave | response | / | nm | ct | fixed-width block

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