Pythonic way to read csv files from a folder in repository
It seems to me that: 1) the path should be a function argument 2) but the function as it stands is very short and does only one thing - you actually don't need a function for this because there is nothing particular that can be reused.
Since the file is going to reside in a specific path, use a constant, it can be defined inside a config file. Quite likely, you may have other options or hardcoded stuff, so it's good to use a config file to keep it all in the same place.
eg:
config.py
PLAYER_FILES_DIR = &quot;/dev/player-assignment/src/player_test/player_test_input/&quot;

And then in your code you import the config file and you can refer to the location path as config.PLAYER_FILES_DIR:
import config

df = pd.read_csv(config.PLAYER_FILES_DIR...)
# do something

pathlib can still possibly be used if you intend to read multiple files from the directory.