Could not textwrap.wrap(replace_whitespace=False, drop_whitespace=False) be used here?

Perhaps. I experimented a little bit with textwrap.TextWrapper but it does not support custom suffix like line continuation characters.

A simpler approach could be to use textwrap, then split("\n") and prepend/append the needed quotes and continuation:

wrapped = textwrap.wrap(...)
for line in wrapped:
    # add indent, add quoted line, add suffix and newline

prefix + separator.join(textwrap.wrap(...)) + suffix

prefix + separator.join(textwrap.wrap(...)) + suffix

Unfortunately, not so simple.

For example, we don't want the suffix to be applied to the last line.

I think 3de2378 should do the trick.

Thank you for the reviews!