docstr: True if string s is not a ctext character of RFC822.
          
docstr_tok: ["True","if","string","s","is","not","a","ctext","character","of","RFC822","."]
code: def _nonctext(self, s):
      """True if string s is not a ctext character of RFC822."""
      return s.isspace() or s in ("(", ")", "\\")
  
imports: import re
  import binascii
  import email.quoprimime
  import email.base64mime
  from email.errors import HeaderParseError
  from email import charset
label_desc: Use image node_id 5 for calling the Header obj's underlying member method code with example usage: obj._nonctext(s) and returns: unknown