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  1. POIPython notebook doesn't work
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    <p>I tried to run IPython notebook. I entered following in the commandline:</p> <p>ipython notebook</p> <p>I get the following error (stack trace)</p> <pre><code>&gt; Traceback (most recent call last): File &gt; "C:\Python27\Scripts\ipython-script.py", line 9, in &lt;module&gt; &gt; load_entry_point('ipython==0.13.1', 'console_scripts', 'ipython')() File &gt; "C:\Python27\lib\site-packages\IPython\frontend\terminal\ipapp.py", &gt; line 388, in launch_new_instance &gt; app.initialize() File "&lt;string&gt;", line 2, in initialize File "C:\Python27\lib\site-packages\IPython\config\application.py", line &gt; 84, i n catch_config_error &gt; return method(app, *args, **kwargs) File "C:\Python27\lib\site-packages\IPython\frontend\terminal\ipapp.py", &gt; line 313, in initialize &gt; super(TerminalIPythonApp, self).initialize(argv) File "&lt;string&gt;", line 2, in initialize File &gt; "C:\Python27\lib\site-packages\IPython\config\application.py", line &gt; 84, i n catch_config_error &gt; return method(app, *args, **kwargs) File "C:\Python27\lib\site-packages\IPython\core\application.py", line 325, &gt; in initialize &gt; self.parse_command_line(argv) File "C:\Python27\lib\site-packages\IPython\frontend\terminal\ipapp.py", &gt; line 308, in parse_command_line &gt; return super(TerminalIPythonApp, self).parse_command_line(argv) File "&lt;string&gt;", line 2, in parse_command_line File &gt; "C:\Python27\lib\site-packages\IPython\config\application.py", line &gt; 84, i n catch_config_error &gt; return method(app, *args, **kwargs) File "C:\Python27\lib\site-packages\IPython\config\application.py", line &gt; 420, in parse_command_line &gt; return self.initialize_subcommand(subc, subargv) File "&lt;string&gt;", line 2, in initialize_subcommand File &gt; "C:\Python27\lib\site-packages\IPython\config\application.py", line &gt; 84, i n catch_config_error &gt; return method(app, *args, **kwargs) File "C:\Python27\lib\site-packages\IPython\config\application.py", line &gt; 352, in initialize_subcommand &gt; subapp = import_item(subapp) File "C:\Python27\lib\site-packages\IPython\utils\importstring.py", line &gt; 40, i n import_item &gt; module = __import__(package,fromlist=[obj]) File "C:\Python27\lib\site-packages\IPython\frontend\html\notebook\__init__.py &gt; ", line 8, in &lt;module&gt; &gt; raise ImportError(msg) ImportError: The IPython Notebook requires tornado &gt;= 2.1.0 </code></pre> <p>how do I fix this? I have Python version 2.7</p>
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