docs: def get_injected_modules(classname):
      r"""
      Example:
          >>> # DISABLE_DOCTEST
          >>> from utool.util_class import __CLASSNAME_CLASSKEY_REGISTER__  # NOQA
      """
      modname_list = __CLASSNAME_CLASSKEY_REGISTER__[classname]
  
      injected_modules = []
      for modstr in modname_list:
          parts = modstr.split('.')
          pkgname = '.'.join(parts[:-1])
          modname = parts[-1]
          try:
              exec('from %s import %s' % (pkgname, modname, ), globals(), locals())
              module = eval(modname)
              injected_modules.append(module)
          except ImportError as ex:
              ut.printex(ex, 'Cannot load package=%r, module=%r' % (pkgname, modname, ))
      return injected_modules