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)

explaination:
- read_and_write: takes source and target as arguments and returns nothing.
- The function reads data from source file and is processed by iscommand function and written to target file.
- Contents stores the data from source file after splitting it into a list.
- The data is then passed onto the iscommand function where it is processed and written to target file.