title: Install apache airflow in python 3.7.3
body: <p>I have python2.7 and 3.7 both installed on my Mac machine. I have set python3 default in .bash_profile file using </p>
  
  <pre><code>alias python=python3
  alias pip=pip3
  </code></pre>
  
  <p>when i hit the below command </p>
  
  <pre><code>pip install apache-airflow
  </code></pre>
  
  <p>it says</p>
  
  <pre><code>Requirement already satisfied: apache-airflow in /Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages (1.10.3)
  </code></pre>
  
  <p>But when i hit the command "airflow version", it says command not found.</p>
  
  <p>So how to install apache airflow for python3</p>