This little method takes three permission values and
returns a three-character string formatted in the
convention. The read permission is formatted as
"r" if true,
"-" if false. Similarly, the write
permission is formatted as
"-", and the execute
Each argument is nonzero if the permission is set, zero if it is not set.
# - - - P a t h I n f o . _ _ r w x - - - def __rwx ( self, r, w, x ): """Format three permission bits. [ r, w, and x are Boolean values indicating read, write and execute permissions -> return a three-character string displaying those permissions as "ls -l" displays them ] """
.__dasher() method handles
generation of either a letter or a dash depending on
the permission value.
return ( "%s%s%s" % (self.__dasher ( r, "r" ), self.__dasher ( w, "w" ), self.__dasher ( x, "x" ) ) )