Python function scope - Day 20(after 20 days)

this will explain how the scope of the variable works

here we are trying to plot the parabola by calling the function

we have used canvas variable one inside and another outside of the function to show how the scope works

  
#this will explain the scope of the variable
#we can use locals() to know the variable in that scopre,this can be used only inside functions

import tkinter


def parabola(x):
    y = x * x/100
    return y


def draw_axes(canvas):
    #the canvas variable here is different from the canvas outside
    #of this function
    # canvas.update
    #here the x and y origin are not fetching properly so hardcoded the values
    # x_origin = canvas.winfo_width ()/2
    # y_origin = canvas.winfo_height()/2
    # x_origin = canvas.winfo_width ()
    # y_origin = canvas.winfo_height()
    canvas.configure(scrollregion=(-200,-200,200,200))
    canvas.create_line(-200,0,200,0, fill="blue")
    canvas.create_line(0,200,0,-200, fill="blue")
    #this will give the object location(address),we can differentiate object of same names
    #using this id()
    print(id(canvas))
    print(locals())

def plot(canvas,x,y):
    canvas.create_line(x,y,x+1,y+1,fill="red")

mainwindow = tkinter.Tk()

mainwindow.title("Parabola")
mainwindow.geometry("640x480")

canvas = tkinter.Canvas(mainwindow,width=320,height= 480)
canvas.grid(row=0,column=0)

#we have created two canvas to show how the scope works
canvas2 = tkinter.Canvas(mainwindow,width=320,height= 480)
canvas2.grid(row=0,column=1)

print(id(canvas))
print(id(canvas2))

draw_axes(canvas)
draw_axes(canvas2)

for x in range(-100,100):
    y = parabola(x)
    plot(canvas,x,-y)


mainwindow.mainloop()