Packages are features that can be added to a modo item to add channels and extend functionality. This may be to override drawing, add extra transforms, or provide some complex functionality that was beyond the capabilities of the original item. This sample demonstrates testing an item to see which packages it has.

packageTest.py

import lx

hstSvc = lx.service.Host ()
hstSvc.SpawnForTagsOnly ()

allPackages = []
containsPackages = []

for i in range (hstSvc.NumServers (lx.symbol.a_PACKAGE)):
    factory = hstSvc.ServerByIndex (lx.symbol.a_PACKAGE, i)
    
    try:
        factory.InfoTag (lx.symbol.sPKG_SUPERTYPE)
        continue
    
    except:
        
        '''
            We rely on the fact that this will fail if the super type
            is undefined. If it is, the package is a true Package that
            can be added to items, so we catch the error and add it to
            the list.
        '''
        allPackages.append (factory.Name ())
        
for package in allPackages:
    if item.PackageTest (package) == True:
        containsPackages.append (package)