Index: cgi.rst
===================================================================
--- cgi.rst	(Revision 73861)
+++ cgi.rst	(Arbeitskopie)
@@ -92,12 +92,13 @@
 various environment variables set according to the CGI standard).  Since it may
 consume standard input, it should be instantiated only once.
 
-The :class:`FieldStorage` instance can be indexed like a Python dictionary, and
-also supports the standard dictionary methods :meth:`has_key` and :meth:`keys`.
-The built-in :func:`len` is also supported.  Form fields containing empty
-strings are ignored and do not appear in the dictionary; to keep such values,
-provide a true value for the optional *keep_blank_values* keyword parameter when
-creating the :class:`FieldStorage` instance.
+The :class:`FieldStorage` instance can be indexed like a Python dictionary,
+allows membership testing with the ``in`` operator, and also supports the
+standard dictionary methods :meth:`has_key` and :meth:`keys` as well as the
+built-in :func:`len` function.  Form fields containing empty strings are
+ignored and do not appear in the dictionary; to keep such values, provide a
+true value for the optional *keep_blank_values* keyword parameter when creating
+the :class:`FieldStorage` instance.
 
 For instance, the following code (which assumes that the
 :mailheader:`Content-Type` header and blank line have already been printed)
@@ -105,7 +106,7 @@
 string::
 
    form = cgi.FieldStorage()
-   if not (form.has_key("name") and form.has_key("addr")):
+   if not ("name" in form and "addr" in form):
        print "<H1>Error</H1>"
        print "Please fill in the name and addr fields."
        return