The correct RFC to reference is RFC-1521 (MIME part one), not 1421 (PEM).

gvanrossum · gvanrossum · commit d2783da63ec5 · 2000-01-03T15:44:40.000Z
diff --git a/Lib/base64.py b/Lib/base64.py
@@ -1,9 +1,6 @@
 #! /usr/bin/env python
 
-# Conversions to/from base64 transport encoding as per RFC-MIME (Dec 1991
-# version).
-
-# Parameters set by RFC-1421.
+# Conversions to/from base64 transport encoding as per RFC-1521.
 #
 # Modified 04-Oct-95 by Jack to use binascii module
 

Original file line number	Diff line number	Diff line change
`@@ -1,9 +1,6 @@`
`1`	`1`	`#! /usr/bin/env python`
`2`	`2`
`3`		`-# Conversions to/from base64 transport encoding as per RFC-MIME (Dec 1991`
`4`		`-# version).`
`5`		`-`
`6`		`-# Parameters set by RFC-1421.`
	`3`	`+# Conversions to/from base64 transport encoding as per RFC-1521.`
`7`	`4`	`#`
`8`	`5`	`# Modified 04-Oct-95 by Jack to use binascii module`
`9`	`6`