From 65e8be46bca946d93c9e8eb7060b5fc6b8cbaff2 Mon Sep 17 00:00:00 2001
From: Ismael Carnales <icarnales@gmail.com>
Date: Thu, 19 Feb 2009 19:05:45 +0000
Subject: [PATCH] add typecheck of funcs in ExtractorField.__init__

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%40887
---
 scrapy/trunk/scrapy/contrib_exp/newitem/extractors.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/scrapy/trunk/scrapy/contrib_exp/newitem/extractors.py b/scrapy/trunk/scrapy/contrib_exp/newitem/extractors.py
index cb9eef586..29e15f025 100644
--- a/scrapy/trunk/scrapy/contrib_exp/newitem/extractors.py
+++ b/scrapy/trunk/scrapy/contrib_exp/newitem/extractors.py
@@ -37,6 +37,10 @@ class ItemExtractor(object):
 
 class ExtractorField(object):
     def __init__(self, funcs):
+        if not hasattr(funcs, '__iter__'):
+            raise TypeError(
+                'You must initialize ExtractorField with a list of callables')
+
         self._funcs = []
 
         for func in funcs: