title: How to change the opacity of a line?
body: <p>I did some research about opacity but I didn't find anything about the lines.
  I found some topics about the window or a rectangle only.</p>
  <p>I would like to know if it is possible to have on Tkinter colored lines with a certain opacity that can be adjusted.</p>
  <pre><code>dashboard.create_line(init_x,init_y,event.x,event.y,width=pen_width,fill=pen_color,capstyle=ROUND,smooth=True,tag=&quot;line &quot;+str(selectLine)
  </code></pre>