Module which provides compatibility with older Python versions.
which(cmd, mode=os.F_OK | os.X_OK, path=None)¶
Given a command, mode, and a PATH string, return the path which conforms to the given mode on the PATH, or None if there is no such file.
mode defaults to os.F_OK | os.X_OK. path defaults to the result of os.environ.get(“PATH”), or can be overridden with a custom search path.