Usage of zipp.Path causes attempt to write after ZipFile is closed

[nwh]

Hello! I am attempting to use zipp.Path to construct a zip archive. I encountered the following issue:

import io
from zipfile import ZipFile
import zipp

def make_zip():
    """Make zip file and return bytes."""
    bytes_io = io.BytesIO()
    zip_file = ZipFile(bytes_io, mode="w")
    zipp_path = zipp.Path(zip_file)
    
    # use zipp.Path.open
    with zipp_path.joinpath("file-a").open(mode="wb") as fp:
        fp.write(b"contents of file-a")

    zip_file.close()

    data = bytes_io.getvalue()

    bytes_io.close()
    
    return data

zip_data = make_zip()
# Exception ignored in: <bound method ZipFile.__del__ of <zipp.CompleteDirs [closed]>>
# Traceback (most recent call last):
#   File "/Users/nw_henderson/.pyenv/versions/3.6.10/lib/python3.6/zipfile.py", line 1686, in __del__
#     self.close()
#   File "/Users/nw_henderson/.pyenv/versions/3.6.10/lib/python3.6/zipfile.py", line 1703, in close
#     self.fp.seek(self.start_dir)
# ValueError: I/O operation on closed file.

Following the zipfile docs, I call close() before extracting the data from bytes_io. It looks like zipp.Path keeps some other reference to the file object and attempts to write when make_zip returns and objects are cleaned up. Python 3.8 exhibits the same issue.

[jaraco]

Thanks for the report. I'm following the issue upstream.