Python tkinter widgets not showing

Question

I have created two widgets: a label and a canvas they are inside of a class and in the init method of the class. For some reason, none of the widgets show up and it just gives me a blank tkinter window.

def __init__ (self, master):
    self.mousepos = 0,0
    self.clickpos = 0,0
    self.poslabel = Label(master, text = "Mouse Click: " 
                          + str(self.clickpos) + "Cursor Point: "
                          + str(self.mousepos))
    self.poslabel.pack()
    self.fcanvas = Canvas(master,width=800,height=400, bg = 'grey90',
                          borderwidth = 5, relief = RAISED)
    self.fcanvas.bind("<Button-1>", self.pressButton1)
    self.fcanvas.pack()

Answer 1

If that is all of your code, you're forgetting to run the mainloop method of your root window. Window drawing happens via events that are processed by the event loop; if it doesn't run, the windows don't get the opportunity to draw themselves on the screen.