How to exclude a directory from search when using Python rglob?

Question

Here is the code:

# Now create libraries for any asys Simulation Models that are present in the module
asysdir = moduleRootDir / asys_sys_tail
asys_systems = []
if asysdir.is_dir():
    asys_systems = [x for x in asysdir.iterdir() if
                (x.is_dir() and (x.name != '.asys_edit'))]

asyslibslist = []
for sys in asys_systems:
    libname = "lib_asys_" + sys.name
    lib = vu.add_library(libname)
    for ext in extensions:
        matches = set(item for item in sys.rglob(str("*") + str(ext)))
        for match in matches:
            # Check for duplications in the "rtlfiles" list
            if match.parent.name == 'mentor':
                logger.debug("Match to /mentor/ file!! " + str(match.absolute()))
                continue
            elif match.name in [item.name for item in DupList]:
                logger.debug("Item in DupList! : " + str(match.name))
                continue
            elif match.name in GlobalExclusions:
                continue
            else:
                logger.debug("Adding to lib " + str(libname) + " :" + str(match.absolute()))
                lib.add_source_file(match.absolute())
                DupList.append(match)
    asyslibslist.append(lib)
    # Print the DupList after each module
    print_duplist(DupList)

This code starts search in a folder called 'asys_systems'. It checks what folder exist inside it and adds it into collection asys_systems. Then, it searches for files inside each folder in the asys_systems collection.

I have no experience with Python but need to change this code so to limit the recursive search. For example, we have this folder structure:

asys_system_1
  sub_folder_1
  sub_folder_2

I want that all the files inside asys_system_1 be searched through, and also sub_folder_2 but not sub_folder_1.

How to exclude certain sub-folder from being searched by the sys.rglob?