class_docstr: Extract Python Doc Strings, removing them from the AST and putting them in
  a dictionary for later use.
  
  >>> import gast as ast
  >>> from pythran import passmanager, backend
  >>> node = ast.parse("def foo(): 'my doc is cool' ; pass")
  >>> pm = passmanager.PassManager("test")
  >>> _ = pm.apply(ExtractDocStrings, node)
  >>> print(pm.dump(backend.Python, node))
  def foo():
      pass
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code: def run(self, node):
      super(ExtractDocStrings, self).run(node)
      return self.docstrings
  
file_path: pythran/pythran/transformations/extract_doc_strings.py
imports: from pythran.passmanager import Transformation
  from pythran.utils import isstr
  import gast
label_desc: Use image node_id 2 for calling the ExtractDocStrings obj's underlying member method code with example usage: obj.run(node) and returns: self