Added Tim's names to avoid (with the addition of cap-I which looks

like an `l' in some fonts).

pep-0008.txt

@@ -392,6 +392,14 @@ Naming Conventions
 
   Prescriptive: Naming Conventions
 
+    Names to Avoid
+
+      Never use the characters `l' (lowercase letter el), `O'
+      (uppercase letter oh), or `I' (uppercase letter eye) as single
+      character variable names.  In some fonts, these characters are
+      indistinguisable from the numerals one and zero.  When tempted
+      to use `l' use `L' instead.
+
     Module Names
 
       Module names can be either CapWords or lowercase.  There is no