How to install airflow?
<p>I seem to be doing sth. wrong.</p>

<p><a href="https://pythonhosted.org/airflow/start.html" rel="noreferrer">https://pythonhosted.org/airflow/start.html</a></p>

<pre><code>$ export AIRFLOW_HOME=~/airflow
$ pip install apache-airflow
Requirement already satisfied
$ airflow initdb
airflow: Command not found 
</code></pre>

<blockquote>
  <p>python --version<br>
  Python 2.7.10</p>
</blockquote>

<p>It's weird - the installation seemed to have worked fine (with some warnings - nothing serious) saying: airflow, flask, etc. successfully installed. But even after restarting the PC (Ubuntu 15.10) airflow seems not to be a command.</p>