class_docstr: Assemble a unicode string.
      
class_docstr_tok: ["Assemble","a","unicode","string","."]
code: def append(self, characters):
      if isinstance(characters, _bytes):
          # this came from a Py2 string literal in the parser code
          characters = characters.decode("ASCII")
      assert isinstance(characters, _unicode), str(type(characters))
      self.chars.append(characters)
  
imports: from __future__ import absolute_import
  import re
  import sys
label_desc: Use image node_id 2 for calling the UnicodeLiteralBuilder obj's underlying member method code with example usage: obj.append(characters) without return types