code: def _iter_escaped_chars(addr):
      pos = 0
      escape = False
      for pos, ch in enumerate(addr):
          if escape:
              yield (pos, "\\" + ch)
              escape = False
          elif ch == "\\":
              escape = True
          else:
              yield (pos, ch)
      if escape:
          yield (pos, "\\")
  
imports: import os
  import re
  import time
  import datetime
  import urllib.parse
  from email._parseaddr import quote
  from email._parseaddr import AddressList
  from email._parseaddr import mktime_tz
  from email._parseaddr import parsedate, parsedate_tz, _parsedate_tz
label_desc: Use image node_id 4 for calling a global function with example usage: _iter_escaped_chars(addr) without return types