docstr: Returns Guild package name for a given project name.
  
  Raises TypeError if project name is not a namespace member.
docstr_tok: ["Returns","Guild","package","name","for","a","given","project","name",".","Raises","TypeError","if","project","name","is","not","a","namespace","member","."]
code: def package_name(self, _project_name):
      """Returns Guild package name for a given project name.
  
      Raises TypeError if project name is not a namespace member.
      """
      raise NotImplementedError()
  
imports: import re
  from collections import namedtuple
  import guild
  from guild.entry_point_util import EntryPointResources
label_desc: Use image node_id 5 for calling the Namespace obj's underlying member method code with example usage: obj.package_name(_project_name) without return types