'combobox get() with if statemnt GUI TKINTER python

I am not sure how to apply the if statement with 3 different combobox within Python class with different defining functions (after building the GUI) so when you press the bottom you connected with different defining fucntion.

as shown below :

class Toplevel1:
    def __init__(self, top=None):
        '''This class configures and populates the toplevel window.
           top is the toplevel containing window.'''
        . 
        . 
        .

          
   def supercell_generation(e): 
     
        if self.TCombobox1_1.get() == "Au":
            self.TCombobox1_2.get() == "32"
            self.TCombobox1_3.conf() == "Cubic Closed Packed":
            self.Generate(command = supercell_3())
            if not self.TCombobox1_2.get() == "64"
                   self.TCombobox1_3.conf() == "FCC":
                   self.Generate(command = supercell_4())
                button.pack()

root = Tk()
app = Toplevel1(root)
root.wm_title("Supercell")
root.mainloop()
    



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