Answer by Louis Maddox for Python doctest how to match single or double quote in output as opposed to only single quote

I imagine you could achieve this with blacken-docs but I haven't seen an example of this done yet...

Either the approach of:

• Leave the strings in black standard (double quoted) and find a way to transform the expected output doctest so that it has double quotes (by running black on it somehow?)
• Run blacken-docs with a single quote setting applied, which also avoids having to think about it yourself

I would instinctively go for the first option because it feels like it solves the problem better, but I expect it is easier to do the latter (and TBH not needing to think about this too much would be a plus).

Upon looking into it though, this doesn't seem supported at present according to this issue, and running blacken-docs on some code which prints a double-quoted __repr__ in a >>> doctest block does not affect said double quoting.

My interpretation of that issue and the other one it links to is that blacken-docs does not support code blocks in the format:

"""Docstring starts here.Code example comes next:>>> from some_module import some_func>>> some_func(1, 2)"1+2""""

I've tried rewriting code in the suggested format:

"""Docstring starts here.Code example comes next:.. code-block:: python>>> from some_module import some_func>>> some_func(1, 2)"1+2""""

but this gives me

code block parse error Cannot parse: 1:0: >>> from some_module import some_func

So I'm not going to use blacken-docs or the more verbose .. code-block: python format, perhaps in time it'll be supported.