From d4f5255498d07b424ba5d6b8535aedc3ec40808a Mon Sep 17 00:00:00 2001
From: Stefan Israelsson Tampe <stefan.itampe@gmail.com>
Date: Fri, 1 Dec 2017 17:24:12 +0100
Subject: string formatter library

---
 modules/language/python/list.scm | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'modules/language/python/list.scm')

diff --git a/modules/language/python/list.scm b/modules/language/python/list.scm
index 34c9ba0..0131328 100644
--- a/modules/language/python/list.scm
+++ b/modules/language/python/list.scm
@@ -727,6 +727,10 @@
 
 
 (defpair (len l)  (length l))
+(define-method (len x)
+  (if (null? x)
+      0
+      (error "not a suitable lengthof")))
 (define-method (len (v <vector>))  (vector-length v))
 (define-method (len (s <string>))  (string-length s))
 (define-method (len (o <py-list>)) (slot-ref o 'n))
-- 
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