Be more consistent, both internally and with recommended practice.
This closes SF bug #547953.
diff --git a/Doc/lib/libcgi.tex b/Doc/lib/libcgi.tex
index 4ce4f5c..2f590a8 100644
--- a/Doc/lib/libcgi.tex
+++ b/Doc/lib/libcgi.tex
@@ -135,16 +135,14 @@
\samp{form.getvalue(\var{key})} would return a list of strings.
If you expect this possibility
(when your HTML form contains multiple fields with the same name), use
-the \function{type()} built-in function to determine whether you
+the \function{isinstance()} built-in function to determine whether you
have a single instance or a list of instances. For example, this
code concatenates any number of username fields, separated by
commas:
\begin{verbatim}
-from types import ListType
-
value = form.getvalue("username", "")
-if isinstance(value, ListType):
+if isinstance(value, list):
# Multiple username fields specified
usernames = ",".join(value)
else: