Append *multiple* paths to PYTHONPATH in fish

Here I read how to append to PYTHONPATH in fish, and that works fine for one string.

However, if I do this:

set --export PYTHONPATH $PYTHONPATH path1 path2

I get this:

>> import os>> os.environ["PYTHONPATH"]'path1\x1epath2'

Alternatively:

$ python -c "import os; print os.environ['PYTHONPATH']"path1path2

What's wrong here?