From 83600050d0aacd17e10f426881394237aca79f8e Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Tue, 18 Nov 1997 15:50:39 +0000
Subject: Assert that the proxies object passed in to the URLopener constructor
 is indeed a dictionary (or a mapping).

---
 Lib/urllib.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Lib/urllib.py b/Lib/urllib.py
index a818adf..02edb3b 100644
--- a/Lib/urllib.py
+++ b/Lib/urllib.py
@@ -87,6 +87,7 @@ class URLopener:
 	def __init__(self, proxies=None):
 		if proxies is None:
 			proxies = getproxies()
+		assert hasattr(proxies, 'has_key'), "proxies must be a mapping"
 		self.proxies = proxies
 		server_version = "Python-urllib/%s" % __version__
 		self.addheaders = [('User-agent', server_version)]
-- 
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