title: PyQT5 QComboBox - get value of combobox
body: <p>I am still very new to Qt but I am developing a type of calculator and want to use a combobox to select a coefficient. I have had success creating a combobox with a liststore in pyGT but it appears pyQT is quite different. </p>
  
  <p>I am having a hard time wrapping my head around the data models and list models. Essentially I want to have a name show up in the combobox and have the value of that name get passed to the calculator equation. Everything I have seen so far has been just for single entries and not 'associated' entries. </p>
  
  <p>Can anyone explain or point me to a tutorial to walk me through what I am trying to accomplish?</p>