code: def _check_parenthesis(addr):
      # Ignore parenthesis in quoted real names.
      addr = _strip_quoted_realnames(addr)
  
      opens = 0
      for pos, ch in _iter_escaped_chars(addr):
          if ch == "(":
              opens += 1
          elif ch == ")":
              opens -= 1
              if opens < 0:
                  return False
      return opens == 0
  
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 7 for calling a global function with example usage: _check_parenthesis(addr) and returns: unknown, False