Untitled

from tkinter import *
from tkinter.colorchooser import askcolor

class DrawingApp:

    def __init__(self, master):
        self.master = master
        self.master.title("Drawing App")

        self.pen_size = 5
        self.color = "black"
        self.old_coords = None

        self.canvas = Canvas(self.master, width=500, height=500, bg="white")
        self.canvas.pack(expand=YES, fill=BOTH)
        self.canvas.bind("<B1-Motion>", self.draw)

        self.pen_button = Button(self.master, text="Pen", command=self.use_pen)
        self.pen_button.pack(side=LEFT)

        self.color_button = Button(self.master, text="Color", command=self.choose_color)
        self.color_button.pack(side=LEFT)

        self.clear_button = Button(self.master, text="Clear", command=self.clear_canvas)
        self.clear_button.pack(side=LEFT)

    def draw(self, event):
        if self.old_coords:
            x1, y1 = self.old_coords
            x2, y2 = event.x, event.y
            self.canvas.create_line(x1, y1, x2, y2, width=self.pen_size, fill=self.color, capstyle=ROUND, smooth=TRUE)

        self.old_coords = event.x, event.y

    def use_pen(self):
        self.canvas.bind("<B1-Motion>", self.draw)

    def choose_color(self):
        self.color = askcolor()[1]

    def clear_canvas(self):
        self.canvas.delete("all")
        self.old_coords = None

if __name__ == "__main__":
    root = Tk()
    app = DrawingApp(root)
    root.mainloop()