Is there an idiomatic way to add an extension using Python's Pathlib?

The with_suffix method will return a new path with a different extension, either changing an existing extension or adding a new one. Examples from the docs:

>>> p = PureWindowsPath('c:/Downloads/pathlib.tar.gz')>>> p.with_suffix('.bz2')PureWindowsPath('c:/Downloads/pathlib.tar.bz2')>>> p = PureWindowsPath('README')>>> p.with_suffix('.txt')PureWindowsPath('README.txt')

In your case, p.with_suffix(ext) would do the job.

For cases where you need to add a suffix after any existing suffixes instead of removing existing suffixes, you can use p.with_suffix(p.suffix+ext). This is kind of clunky, though, and I don't know whether I would prefer it over Path(str(p)+ext).

You might use pathlib3x - it offers a backport of the latest (at the date of writing this answer Python 3.10.a0) Python pathlib for Python 3.6 or newer, and a few additional functions like append_suffix

>>> python -m pip install pathlib3x>>> import pathlib3x as pathlib>>> pathlib.Path('some_path').append_suffix('.ext')PosixPath('some_path.ext')>>> pathlib.Path('some_path.ext.ext2').append_suffix('.ext3')PosixPath('some_path.ext.ext2.ext3')>>> pathlib.Path('some_path.ext').append_suffix('.tar.gz')PosixPath('some_path.ext.tar.gz')

you can find it on github or PyPi

^{Disclaimer: I'm the author of the pathlib3x library.}