code: def add_prefix(dict_like, prefix):
      
      if not isinstance(dict_like, dict):
          try:
              dict_like = dict(dict_like)
          except Exception as e:
              raise ValueError("{0}\nCan't convert container to dict: "
                               "{1}".format(e, dict_like))
      return {prefix + k: v for (k, v) in dict_like.items()}
docs: takes a dict (or dict-like object, e.g. etree._Attrib) and adds the
      given prefix to each key. Always returns a dict (via a typecast).
  
      Parameters
      ----------
      dict_like : dict (or similar)
          a dictionary or a container that implements .items()
      prefix : str
          the prefix string to be prepended to each key in the input dict
  
      Returns
      -------
      prefixed_dict : dict
          A dict, in which each key begins with the given prefix.