From f3b75c940d2fefc3ff5bb4435e507c5959ff903c Mon Sep 17 00:00:00 2001
From: MrMenezes <sr.tama@outlook.com>
Date: Fri, 21 Oct 2016 18:02:16 -0300
Subject: [PATCH] Fix warning to duplicated spider. Issue 2181

---
 scrapy/spiderloader.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/scrapy/spiderloader.py b/scrapy/spiderloader.py
index d4f0f663f..e6c3e64a5 100644
--- a/scrapy/spiderloader.py
+++ b/scrapy/spiderloader.py
@@ -23,7 +23,12 @@ class SpiderLoader(object):
 
     def _load_spiders(self, module):
         for spcls in iter_spider_classes(module):
-            self._spiders[spcls.name] = spcls
+            if spcls.name in self._spiders.keys():
+                import warnings
+                warnings.warn("There are several spiders with the same name (" + spcls.name +
+                              "), this can cause unexpected behavior", UserWarning)
+        self._spiders[spcls.name] = spcls
+    
 
     def _load_all_spiders(self):
         for name in self.spider_modules: