code: def copy(source):
      "Copy a docstring from another source function (if present)"
  
      def do_copy(target):
          if source.__doc__:
              target.__doc__ = source.__doc__
          return target
  
      return do_copy
  
file_path: catboost/contrib/python/matplotlib/py2/matplotlib/docstring.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  from matplotlib import cbook
  import sys
  import types
label_desc: Use image node_id 2 for calling a global function with example usage: copy(source) and returns: do_copy, target