We use many integrated development environments to write python code. I personally use Jupyter Notebook and I recommend everyone to use it. But many of us don't want to install IDE and looking for the "Free no install" option. 
That's why I'm going to suggest some No install IDE which you can use very easily through the internet. 
<ol>
<li><a href="http://Jupyter.org/try" class="autolinkedURL autolinkedURL-url" target="_blank">Jupyter.org/try</a><pre><code> https://jupyter.org/try
</code></pre></li>
<li>Google Collab Online Notebooks<pre><code> https://colab.research.google.com/
</code></pre></li>
<li><a href="http://repl.it" class="autolinkedURL autolinkedURL-url" target="_blank">repl.it</a>
 <a href="https://replit.com/~" class="autolinkedURL autolinkedURL-url" target="_blank">replit.com/~</a></li>
</ol>
and last but not least you can also go to Google and search "Python Interpreter Online" you'll find more options.

We use many **integrated development environments** to write python code. I personally use **Jupyter Notebook** and I recommend everyone to use it. But many of us don't want to install IDE and looking for the "**Free no install**" option. 
That's why I'm going to suggest some No install IDE which you can use very easily through the internet. 

1. Jupyter.org/try
         https://jupyter.org/try
2. Google Collab Online Notebooks
        https://colab.research.google.com/
3. repl.it
      https://replit.com/~

and last but not least you can also go to Google and search "Python Interpreter Online" you'll find more options.

How to write python code without installing IDE?