code: def package_name(self, project_name):
      if not project_name.startswith(self.prefix):
          raise TypeError(
              f"{project_name} is not a member of {self.name} namespace"
          )
      return project_name[len(self.prefix) :]
  
imports: import re
  from collections import namedtuple
  import guild
  from guild.entry_point_util import EntryPointResources
label_desc: Use image node_id 3 for calling the PrefixNamespace obj's underlying member method code with example usage: obj.package_name(project_name) and returns: project_name