from tkinter import *
root = Tk()
canvas = Canvas(root)

def system(system_name, position_x, position_y):
    Button(root, text = system_name).place(x=position_x, y=position_y, width=60, height=20)

# examples :

system("Location1", 10,10)
system("Location2", 50,50)

canvas.grid()
root.mainloop()

def line(system1, system2):
    system1 = center position of system1 = (a,b)
    system2 = center position of system2 = (c,d)
    canvas.create_line((a,b),(c,d))