File methods

• new(file, mode): opens a file for mode] (read by default). mode follows normal C semantics, i.e. "r" is read and "w" is write, and a "+" as the second character opens the file in both modes.
• write(obj): writes the string representation of obj to the file.
• read(bytes): returns a string with up to bytes from the file.
• readline: returns a string containing an entire line from the file.
• seek(position): sets file position to byte indicated by position.
• tell: gets current file position
• filesize: gets size of file
• close: closes the file.