An other alternative is poyo, a lightweight YAML Parser for Python. The project status is currently uncertain and it has some serious issues, but it is way more lighter than PyYaml or StrictYaml, so let's give a try. :)

So today I tried to port it to MicroPython, following the instructions here, and unfortunately it was unsuccessful. It's MicroPython but similar issues would also append in CircuitPython.

For any purpose, I'm going to give more details:

First I compiled the Unix port of MicroPython from sources;
micropython -m upip install -p modules poyo -> got error: Error installing 'poyo': , packages may be partially installed;
cloned the Poyo repo, then always following instructions I edited the setup.py and added import sdist_upip and cmdclass={'sdist': sdist_upip.sdist};
micropython -m upip install build -> got same error: Error installing 'build': , packages may be partially installed;
lets get more details: micropython -c 'import poyo' -> File "poyo/__init__.py", line 3, in <module> | ImportError: no module named 'logging'
ok let's manually install logging: micropython -m upip install -p . micropython-logging
micropython -c 'import poyo' -> File "poyo/parser.py", line 3, in <module> | ImportError: no module named 'functools'
ok let's manually install functools: micropython -m upip install -p . micropython-functools
micropython -c 'import poyo' -> File "poyo/patterns.py", line 53, in <module> | AttributeError: 'module' object has no attribute 'MULTILINE';
ok, so what is the value of the constant in CPython? python -c 'import re; print(re.MULTILINE.value)' -> 8`
ok so I add _RE_MULTILINE = 8 in patterns.py and replace all re.MULTILINE occurences by _RE_MULTILINE;
micropython -c 'import poyo' -> File "poyo/patterns.py", line 58, in <module> | ValueError: error in regex
line 58 is LIST = re.compile(_LIST, re.MULTILINE), so there is a problem with the _LIST regex, which is a concatenation of several regexes - lets try the first one (_INDENT = r"(?P<indent>^ *)");
micropython -c 'import re; re.compile(r"(?P<indent>^ *)")' -> same problem spotted: File "<stdin>", line 1, in <module> | ValueError: error in regex.

So here is the problem: this very light yaml parser contain regexes that are not currently well supported by the micropython.re module (see not supported section).

So basically, the blocking point to have a yaml parser is the lack of good regex support by MicroPython/CircuitPython.

Support for YAML #1995

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