class_docstr: _Locations store code locations(file, linenos).
class_docstr_tok: ["_Locations","store","code","locations","(","file",",","linenos",")","."]
code: def extend(self, obj):
      for file, linenos in obj.items():
          for lineno in linenos:
              self.add(file, lineno)
  
imports: from __future__ import print_function, division, absolute_import
  import collections
label_desc: Use image node_id 3 for calling the _Locations obj's underlying member method code with example usage: obj.extend(obj) without return types