I would suggest to adapt the comments to follow PEP 257, and in particular:
"""
The docstring is a phrase ending in a period. It prescribes the function or method's effect as a command ("Do this", "Return that"), not as a description; e.g. don't write "Returns the pathname ...".
"""

Currently there are two docstrings, one for write() and one for iterparse() (recently added in #9708).  Only the former uses the correct form ("Return" instead of "Returns").