create a function to store the mouse clicks and redraw from the mouse clicks in turtle.

def mouse_c(x, y):
    t.penup()
    t.goto(x, y)
    t.pendown()
    draw_shape()

def draw_shape():
    for i in range(3):
        t.forward(100)
        t.left(120)

t.onscreenclick(mouse_c)