Add missing docstrings.

linkcheck/cmdline.py

@@ -25,6 +25,7 @@ from .director import console
 
 
 class LCArgumentParser(argparse.ArgumentParser):
+    """Custom argument parser to format help text."""
 
     def print_help(self, file=None):
         """Print a help message to stdout."""

linkcheck/cookies.py

@@ -127,6 +127,7 @@ _OctalPatt = re.compile(r"\\[0-3][0-7][0-7]")
 _QuotePatt = re.compile(r"[\\].")
 
 def unquote(str):
+    """Remove string quoting."""
     # If there aren't any doublequotes,
     # then there can't be any special characters.  See RFC 2109.
     if len(str) < 2:

linkchecker-nagios

@@ -55,7 +55,10 @@ Epilog = u"\n".join((Retval, Examples))
 
 # instantiate option parser and configure options
 class ArgumentParser(LCArgumentParser):
+    """Custom argument parser for error reporting."""
+
     def error(self, message):
+        """Print error and exit with error code 3."""
         self.print_usage(sys.stderr)
         self.exit(3, _('%s: error: %s\n') % (self.prog, message))