Python docs says print() function default sep='': http://joxi.ru/EA44JnfonNwLAb.png

While in reality sep=' ':
http://joxi.ru/n2YXyRsbw6oYm6.png

Probably it's a bug with space not being escaped in html to prevent trimming.

In the sphinx source it's ' ' so maybe it's a problem with the rendering part.

https://raw.githubusercontent.com/python/cpython/master/Doc/library/functions.rst

.. function:: print(*objects, sep=' ', end='\\n', file=sys.stdout, flush=False)

Space is not trimmed. You can confirm there is a space by copy&paste it from rendered HTML.

  print(*objects, sep=' ', end='\n', file=sys.stdout, flush=False)¶

So this is caused by rendering <em>sep=' '</em>.
I don't like <em>, but I'm not sure this can be customized by theme.

https://github.com/sphinx-doc/sphinx/pull/6401/files

Recent Sphinx uses <em class="sig-paren">.
So we can add style like this:

  .sig-paren {
    font-family: monospace, sans-serif;
    font-style: normal;
  }

Maybe just explain defaults in the text?

   Print *objects* to the text stream *file* (the standard output by default), separated by *sep* (a space by default) and followed
   by *end* (a newline by default).

PR 17062 about stating it's a space by default has been rejected.

I also feel we should just enhance the space width in the prototype.

I personally see the space, but as it's in italic, I can understand it's very easy to miss it.

I like the `font-family: monospace, sans-serif; font-style: normal;` a lot, it make it clear, see screenshot, but it's an issue for python-docs-theme, opening it there: https://github.com/python/python-docs-theme/issues/42

Hi!

Thanks Alex for reporting, and everyone involved.

This has been fixed in python-docs-theme, so it's fixed for >=3.8. As 3.7 is in security-only (and embeds python-docs-theme), better not touch it.

Bests.