title: Openslides on Ubuntu 18.04
body: <p>I'm trying to install <a href="https://openslide.org/api/python/" rel="nofollow noreferrer">Openslide</a> to visualize medical pictures.<br>
  I have followed the simple instructions but I couldn't successfully start Openslide on my laptop.</p>
  
  <p>I used:    </p>
  
  <pre><code>pip install openslides
  </code></pre>
  
  <p>but i get this error when i run "openslides" from my terminal:</p>
  
  <pre><code>Traceback (most recent call last):
  File "/home/andrea/.local/bin/openslides", line 7, in &lt;module&gt;
  from openslides.__main__ import main
  File "/home/andrea/.local/lib/python2.7/site-packages/openslides/__main__.py", line 12, in &lt;module&gt;
  from openslides.utils.arguments import arguments
  File "/home/andrea/.local/lib/python2.7/site-packages/openslides/utils/arguments.py", line 8
  def __getitem__(self, key: str) -&gt; Any:
                           ^
  SyntaxError: invalid syntax
  </code></pre>
  
  <p>I also tried using the <a href="https://github.com/openslide/openslide-python" rel="nofollow noreferrer">openslides-python</a> package but i cannot figure out how to evoke it from terminal.</p>
  
  <p>I'm using Python 2.7</p>
  
  <p>Thanks in advance for your help.</p>