module on sys.path.

Arguments (all optional):

skip_curdir: if true, skip current directory (default True)
maxlevels:   max recursion level (default 0)
force: as for compile_dir() (default False)
quiet: as for compile_dir() (default 0)
legacy: as for compile_dir() (default False)
optimize: as for compile_dir() (default -1)
invalidation_mode: as for compiler_dir()
Tr