class io.BufferedWriter(raw, buffer_size=DEFAULT_BUFFER_SIZE) A buffer providing higher-level access to a writeable, sequential

readall() Read and return all the bytes from the stream until EOF, using multiple calls to the stream if necessary.

os.lockf(fd, cmd, len) Apply, test or remove a POSIX lock on an open file descriptor. fd is an open file descriptor

line_buffering Whether line buffering is enabled.

platform.python_compiler() Returns a string identifying the compiler used for compiling Python.

os.get_blocking(fd) Get the blocking mode of the file descriptor: False if the O_NONBLOCK flag is

os.cpu_count() Return the number of CPUs in the system. Returns None if undetermined.

class io.BufferedRWPair(reader, writer, buffer_size=DEFAULT_BUFFER_SIZE) A buffered I/O object combining two unidirectional

ArgumentParser.print_usage(file=None) Print a brief description of how the ArgumentParser should be invoked on

os.makedev(major, minor) Compose a raw device number from the major and minor device numbers.