IO Library

YASL’s IO library has the following functions and constants.

IO constants

Name	Description
stdin	standard input
stdout	standard output
stderr	standard error

IO functions

Name	Arguments	Description
open	name, mode?	Returns the file from opening name in mode mode. Valid modes are 'r', 'w', 'a', 'r+', 'w+', 'a+'. mode defaults to 'r' if not supplied.

File functions

Name	Arguments	Description
read	self, mode	Valid modes are 'l' and 'a'. If mode is 'l', returns the next line from self. If mode is 'a', reads and returns the entire file.
write	self, val	Writes val to self.
flush	self	Flushes self.