title: Python version for the development
body: <p>I would like to do some development with Python that I don't use for a while and this is always confusing about the versions. It's just one project, so, I would like to stick with Python 3 and use for everything from now on. As Mac OS come with default Python 2.7, I had to install using the brew.</p>
  
  <pre><code>$ brew install python3
  </code></pre>
  
  <p>Later, I export the PATH in the <code>~/.bash_profile</code> using the command, </p>
  
  <pre><code>$ export PATH=/usr/local/opt/python/libexec/bin:$PATH 
  $ source ~/.bash_profile 
  </code></pre>
  
  <p>I can see the Python version 3 from the terminal, </p>
  
  <pre><code>$ python --version
  Python 3.7.2
  
  $ pip --version
  pip 19.0.2 from /usr/local/lib/python3.7/site-packages/pip (python 3.7)
  </code></pre>
  
  <p>As I mentioned, I would like to stick with Python 3 for any kind of development works. My question is is the Python 3 default is set for the Mac OS and will be used for the project without the need for <code>virtualenv</code> setup? </p>