title: Changing font size of all QLabel objects PyQt5
body: <p>I had written a gui using PyQt5 and recently I wanted to increase the font size of all my QLabels to a particular size. I could go through the entire code and individually and change the qfont. But that is not efficient and I thought I could just override the class and set all QLabel font sizes to the desired size.</p>
  <p>However, I need to understand the class written in python so I can figure out how to override it. But I did not find any python documentation that shows what the code looks like for QLabel. There is just documentation for c++. Hence, I wanted to know where I can get the python code for all of PyQt5 if that exists? If not, how can I change the font size of all QLabels used in my code?</p>