class_docstr: A rule line is a single "Allow:" (allowance==True) or "Disallow:"
  (allowance==False) followed by a path.
code: def __str__(self):
      return (
          ("Allow" if self.allowance else "Disallow") + ": " + self.path
      )
  
imports: import collections
  import urllib.parse
  import urllib.request
label_desc: Use image node_id 3 for calling the RuleLine obj's underlying member method code with example usage: obj.__str__() and returns: unknown