ZipFile is documented to accept "path-like" objects but is failing when I try to create one.  I've distilled it down to this small test:

    import zipfile
    from pathlib import Path

    path = Path('test.zip')
    zf = zipfile.ZipFile(path, 'w')
    zf.writestr('test.txt', 'Hello, Sailor!')
    zf.close()

On macOS I'm getting this error:

Traceback (most recent call last):
  File "test.py", line 7, in <module>
    zf.writestr('test.txt', 'Hello, Sailor!')
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 1644, in writestr
    with self.open(zinfo, mode='w') as dest:
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 1348, in open
    return self._open_to_write(zinfo, force_zip64=force_zip64)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 1461, in _open_to_write
    self.fp.write(zinfo.FileHeader(zip64))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/zipfile.py", line 721, in write
    n = self.fp.write(data)
AttributeError: 'PosixPath' object has no attribute 'write'

Using str(path) works fine.

Thanks for the report! Support for path-like objects was added in 3.6.2. I think you either have 3.6.0 or 3.6.1 installed on your system. Please upgrade it to the latest bugfix release.

With 3.6.6, I got the following results:

>>> import zipfile
>>> from pathlib import Path
>>> path = Path('spam.zip')
>>> zf = zipfile.ZipFile(path, 'w')
>>> zf.writestr('test.txt', 'Hello, Sailor!')
>>> zf.close()

$ ./python -m zipfile -l spam.zip 
File Name                                             Modified             Size
test.txt                                       2018-07-24 06:10:52           14