def read_and_write(source, target): """Takes source file and target file, reads data from source file and is processed by iscommand function and written to target file.""" with open(source) as src: with open(target, "a") as tar: for line in src: contents = line.split() iscommand(contents, tar)

From the function read_and_write, the function iscommand is called and the contents of the source file and the target file are passed on to the function iscommand.