ConfigParser: writing a config with an empty unnamed section adds an extra newline to the beginning of the file

[PalmtopTiger]

Bug report

Bug description:

If you read a config with an empty unnamed section using ConfigParser with allow_unnamed_section set to True and write it back, the resulting file will contain an extra newline at the beginning:

from configparser import ConfigParser
from io import StringIO
cfg = ConfigParser(allow_unnamed_section=True)
cfg.read_string('[sect]')
output = StringIO()
cfg.write(output)
print(repr(output.getvalue())) # '\n[sect]\n\n'

CPython versions tested on:

3.13

Operating systems tested on:

Windows

Linked PRs

• gh-129678: ConfigParser: do not write an empty unnamed section #129679

[encukou]

Thank you! Merged to the 3.14 branch.
I don't think this is a bug, though.

To avoid a point release changing the output, I'll not backport to 3.13.

[PalmtopTiger]

Thank you!