code: def _simplify_username(word):
      if "User" in word:
          word = "U" + word.split("User", 1)[1]
      elif isinstance(word, bytes):
          word = word.decode("ascii")
      return word
  
file_path: nltk/nltk/corpus/reader/nps_chat.py
imports: import re
  import textwrap
  from nltk.corpus.reader.api import *
  from nltk.corpus.reader.util import *
  from nltk.corpus.reader.xmldocs import *
  from nltk.internals import ElementWrapper
  from nltk.tag import map_tag
  from nltk.util import LazyConcatenation
label_desc: Use image node_id 10 for calling the NPSChatCorpusReader obj's underlying member method code with example usage: obj._simplify_username(word) and returns: word