Pathlib, Pathlib everywhere.

There are many places where we could make use of Pathlib.

Look for any places that uses with open(...) and ask yourself:

• is the argument a string ?
• would it make sens to make it a Path(),
• how far upstream in the code can I make it a Path.

Don’t try to bite more than you can chew (or more than I can review), try to fix 1 place at a time.

[Carreau]

Hi everyone, I’m trying to review all the PRs, there are many tacking this issues, be careful some of you are sending changes for which there are already other PRs opened.

[MrMino]

Might also be of use: https://docs.python.org/3/library/pathlib.html#correspondence-to-tools-in-the-os-module

There are many places other than with open() that might use pathlib treatment:

-    conda_history = os.path.join(sys.prefix, 'conda-meta', 'history')
-    return os.path.exists(conda_history)
+    return Path(sys.prefix, 'conda-meta', 'history').exists()