diff options
| -rw-r--r-- | Doc/library/cgi.rst | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/Doc/library/cgi.rst b/Doc/library/cgi.rst index 42acdcf..48932d5 100644 --- a/Doc/library/cgi.rst +++ b/Doc/library/cgi.rst @@ -88,12 +88,13 @@ input or the environment (depending on the value of 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:`__contains__` 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) @@ -101,7 +102,7 @@ checks that the fields ``name`` and ``addr`` are both set to a non-empty string:: form = cgi.FieldStorage() - if not ("name" in form and "addr" in form): + if "name" not in form or "addr" not in form: print("<H1>Error</H1>") print("Please fill in the name and addr fields.") return |