Simply using parsec in python

I'm looking at this library, which has little documentation: https://pythonhosted.org/parsec/#examples

I understand there are alternatives, but I'd like to use this library.

I have the following string I'd like to parse:

mystr = """
<kv>
  key1: "string"
  key2: 1.00005
  key3: [1,2,3]
</kv>
<csv>
date,windspeed,direction
20190805,22,NNW
20190805,23,NW
20190805,20,NE
</csv>"""

While I'd like to parse the whole thing, I'd settle for just grabbing the <tags>. I have:

>>> import parsec
>>> tag_start = parsec.Parser(lambda x: x == "<")
>>> tag_end = parsec.Parser(lambda x: x == ">")
>>> tag_name = parsec.Parser(parsec.Parser.compose(parsec.many1, parsec.letter))
>>> tag_open = parsec.Parser(parsec.Parser.joint(tag_start, tag_name, tag_end))

OK, looks good. Now to use it:

>>> tag_open.parse(mystr)
Traceback (most recent call last):
...
TypeError: <lambda>() takes 1 positional argument but 2 were given

This fails. I'm afraid I don't even understand what it meant about my lambda expression giving two arguments, it's clearly 1. How can I proceed?

from Simply using parsec in python