[issue35293] make doctest (Sphinx) emits a lot of warnings

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I still get some warnings about docutils itself, e.g.

/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/_html_base.py:1035: SyntaxWarning: invalid escape sequence \(
  'mathjax': ('\(%s\)', '\\begin{%s}\n%s\n\\end{%s}'),
/Users/guido/v38/lib/python3.8/site-packages/docutils/utils/math/math2html.py:4103: SyntaxWarning: invalid escape sequence \{
  """Check for an empty command: look for command disguised as ending.
/Users/guido/v38/lib/python3.8/site-packages/docutils/utils/math/math2html.py:4563: SyntaxWarning: invalid escape sequence \e
  "A \\begin{}...\end command and what it entails (array, cases, aligned)"
/Users/guido/v38/lib/python3.8/site-packages/docutils/utils/math/latex2mathml.py:154: SyntaxWarning: invalid escape sequence \i
  '\in': '\u2209',
/Users/guido/v38/lib/python3.8/site-packages/docutils/utils/math/latex2mathml.py:155: SyntaxWarning: invalid escape sequence \e
  '\equiv': '\u2262'}
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:1197: SyntaxWarning: invalid escape sequence \w
  none ) = re.split('(\w+)(.*)', settings.literal_block_env)
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:1463: SyntaxWarning: invalid escape sequence \ 
  """Return text with 'problematic' characters escaped.
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:1562: SyntaxWarning: invalid escape sequence \p
  """Return list of label definitions for all ids of `node`
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:1922: SyntaxWarning: invalid escape sequence \p
  self.title.insert(0, '\phantomsection%\n  ')
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:2269: SyntaxWarning: invalid escape sequence \d
  match = re.match('(\d*\.?\d*)\s*(\S*)', length_str)
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:2381: SyntaxWarning: invalid escape sequence \i
  self.out.append('\item[] ')
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:2525: SyntaxWarning: invalid escape sequence \(
  wrapper = '\(%s\)'
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:2804: SyntaxWarning: invalid escape sequence \c
  self.out.append('\n\n{\color{red}%s/%s} in \\texttt{%s}%s\n' %
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/latex2e/__init__.py:2892: SyntaxWarning: invalid escape sequence \l
  self.out.append('}] \leavevmode ')
/Users/guido/v38/lib/python3.8/site-packages/docutils/writers/manpage.py:371: SyntaxWarning: invalid escape sequence \-
  "%(title)s \- %(subtitle)s\n")

----------
nosy: +gvanrossum
versions:  -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35293>
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