You are suggesting something like this, I suppose?

--- a/Lib/netrc.py
+++ b/Lib/netrc.py
@@ -105,8 +105,8 @@ class netrc:
     def __repr__(self):
         """Dump the class data in the format of a .netrc file."""
         rep = ""
-        for host in self.allhosts.keys():
-            for attrs in self.allhosts[host]:
+        for (host, attrlist) in self.allhosts.items():
+            for attrs in attrlist:
                 rep = rep + "machine "+ host + "\n\tlogin " + repr(attrs[0]) + "\n"
                 if attrs[1]:
                     rep = rep + "account " + repr(attrs[1])