docstr: Returns PipInfo for a package or requirement spec.
docstr_tok: ["Returns","PipInfo","for","a","package","or","requirement","spec","."]
code: def pip_info(self, _req):
      """Returns PipInfo for a package or requirement spec."""
      raise NotImplementedError()
  
imports: import re
  from collections import namedtuple
  import guild
  from guild.entry_point_util import EntryPointResources
label_desc: Use image node_id 4 for calling the Namespace obj's underlying member method code with example usage: obj.pip_info(_req) without return types