docs: def get(binary_name):
      """return a valid path to the given binary. Return an error if no existing
      binary can be found.
  
      Parameters
      ----------
      binary_name: string
          a binary name used as a key in the 'binaries' dictionary above
  
      Return
      ------
      string
          full path to binary
      """
      if binary_name not in binaries:
          raise Exception('binary_name: {0} not found'.format(binary_name))
  
      system = platform.system()
      binary_list = binaries[binary_name][system]
  
      # check list for a valid entry
      for filename in binary_list:
          valid_file = shutil.which(filename)
          if valid_file:
              return os.path.abspath(valid_file)