I am having problem with having a GUI interface to be implemented via a second file which just contains the file to read, plots made and some new functions to be evaluated based on that.  

I am trying to create a GUI application using Tkinter. The way I am doing is as follows. I have a background script (say Background.py) which has two functions. Function X loads a data file, does some calculations and outputs a graph. The way I want to trigger this is via a GUI script in another file (GUI.py) which opens a panel with a button and when I click the button the function X in file Background.py should be evaluated and a plot should be shown. Once I check the plot, I can hit another button to close the plot and terminate the function X.  Now I can choose to click another button to trigger the function Y in the file Background.py. These button should allow me to input three values, which should be the input to the function Y in the file Background.py. Once I hit this button, it should trigger the function Y and do what it it asks it to do. Now at the end, after that I can hit the button to close the gui. 

How can I do this?. A general rough idea will be helpful. 

I have put an example as much as I can:( at least the skeleton of the code)
I have a background file say (Background.py) and gui file ( say GUI.py) 

**Background.py**

     
    import numpy

    import matplotlib.pyplot as plt

    import pandas
    
    def progX():
         df = pd.read (myfile)
         
         ##df.stats # doing something and generating a plot from the file

        plt.boxplot(df['col'])
  
        plt.show()
 
          
    
    def progY(y1, y2,y3):

        ## get the y1, y2, y3 from the GUI interface which the user has entered 
        
        #run a code...  and generate an output file

**GUI.py**

    import Background as bg   
    from tkinter import *
    from tkinter.ttk import *
    
    class GUI ():
        
        def create widgets(self):
            #....
        
        def create_panel2(self):
            #create buttons
            panel1 = ...
            btn1 = Button(panel1, text="yyyyy", command=bg.progA)
            btn1.pack() 
        
        def create_panel2(self):
            #create buttons
            panel2 = ...
            btn2 = Button(panel1, text="yyyyy", command=bg.progB)
            btn2.pack() 
    
    All_Entries = []
    
    window = Tk()
    D=GUI(window)
    window.mainloop()
    runprogram1 = bg.progX()
    runprogram2 = bg.probY(x, y, z)

My question is now, does the above makes sense? How can I call the background functions from the GUI?  The statements runprogram1 & runprogram2 are definitely not correct, How can I implement that. Also how will I ensure that I call the proram Y in Background once I have close the output from the program X? 

I guess the questions makes sense. I am new to GUI and having hard time working this out, which I need to. any help will be very much appreciated.