title: NO MODULE NAMED TKCALENDAR
body: <p>I have installed the tkcalendar and xlwt using <code>pip3 install tkcalendar</code> and <code>pip3 install xlwt</code> which is successful and have up to date versions.</p>
  
  <p>Running the code using the command as <code>python3 /home/pi/programename.py</code> works perfectly 
  Using <code>sudo</code> before the command like <code>sudo python3 /home/pi/programename.py</code> fails with error</p>
  
  <blockquote>
    <p>ImportError: No module named tkcalendar.</p>
  </blockquote>
  
  <p>Instlling <code>tkcalendar</code> module using <code>sudo apt-get install tkcalendar</code> gives error like <code>E:Unable to locate package tkcalendar.</code> Please help me how to install the package and clear the error.</p>