Index: Doc/library/cgi.rst
===================================================================
--- Doc/library/cgi.rst	(revision 74149)
+++ Doc/library/cgi.rst	(working copy)
@@ -91,12 +91,13 @@
 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.
+It allows membership testing with the :keyword:`in` operator, and also supports
+the standard dictionary method :meth:`keys` and the built-in function
+:func:`len`.  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)
@@ -104,7 +105,7 @@
 string::
 
    form = cgi.FieldStorage()
-   if not (form.has_key("name") and form.has_key("addr")):
+   if "name" not in form or "addr" not in form:
        print "<H1>Error</H1>"
        print "Please fill in the name and addr fields."
        return