os.sync() Force write of everything to disk. Availability: Unix. New in version 3.3.

os.wait() Wait for completion of a child process, and return a tuple containing its pid and exit status indication: a 16-bit number, whose low byte is the signal number that killed the process, and whose high byte is the exit status (if the signal number is zero); the high bit of the low byte is set if a core file was produced. Availability: Unix.

os.link(src, dst, *, src_dir_fd=None, dst_dir_fd=None, follow_symlinks=True) Create a hard link pointing to src named dst. This function can support specifying src_dir_fd and/or dst_dir_fd to supply paths relative to directory descriptors, and not following symlinks. Availability: Unix, Windows. Changed in version 3.2: Added Windows support. New in version 3.3: Added the src_dir_fd, dst_dir_fd, and follow_symlinks arguments.

math.floor(x) Return the floor of x, the largest integer less than or equal to x. If x is not a float, delegates to x.__floor__(), which should return an Integral value.

exception statistics.StatisticsError Subclass of ValueError for statistics-related exceptions.

common_files Files in both a and b.

add_flag(flag) Set the flag(s) specified by flag without changing other flags. To add more than one flag at a time, flag may be a string of more than one character. The current “info” is overwritten whether or not it contains experimental information rather than flags.

somenamedtuple._source A string with the pure Python source code used to create the named tuple class. The source makes the named tuple self-documenting. It can be printed, executed using exec(), or saved to a file and imported. New in version 3.3.

Handler.filter(record) Applies this handler’s filters to the record and returns a true value if the record is to be processed. The filters are consulted in turn, until one of them returns a false value. If none of them return a false value, the record will be emitted. If one returns a false value, the handler will not emit the record.

class pathlib.PurePosixPath(*pathsegments) A subclass of PurePath, this path flavour represents non-Windows filesystem paths: >>> PurePosixPath('/etc') PurePosixPath('/etc') pathsegments is specified similarly to PurePath.