Python 2.7 Tkinter example.

calcbutton

from Tkinter import *

# main application
master = Tk()
master.geometry("250x150+300+300")
# empty lsit for values
sqrLst = []
multval = 0


# generate 11 squares of 2
def getNums():
    for i in range(11):
        del sqrLst[10:]
        multval = 2 ** i
        sqrLst.append(multval)
        

# print 11 sqaures of 2
def prntNums(): 
    print sqrLst[:]
    return 0


getbutton = Button(master, text="Get 11 Squares of 2", command=getNums)
getbutton.pack()
printbutton = Button(master, text="Print Sqaures", command=prntNums)
printbutton.pack()

mainloop()