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I'm trying to learn NLTK - Natural Language Toolkit written in Python and I want install a sample data set to run some examples. My web connection uses a proxy server, and I'm trying to specify the proxy address as follows: >>> nltk.set_proxy('http://proxy.example.com:3128' ('USERNAME', 'PASSWORD')) >>> nltk.download() But I get an error: Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'str' object is not callable I decided to set up a ProxyBasicAuthHandler before calling nltk.download() : import urllib2 auth_handler = urllib2.ProxyBasicAuthHandler(urllib2.HTTPPasswordMgrWithDefaultRealm()) auth_handler.add_password(realm=None, uri='http://proxy.example.com:3128/', user='USERNAME', passwd='PASSWORD') opener = urllib2.build_opener(auth_handler) urllib2.install_opener(opener) import nltk nltk.download() But now I get HTTP Error 407 - Proxy Autentification Required . The documentation says that if the proxy is set to None then this function will attempt to detect the system proxy. But it isn't working. How can I install a sample data set for NLTK?

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