用python写一个画图软件

好的，您可以使用Python内置的Tkinter库来创建一个画图软件。以下是一个示例代码：

from tkinter import *
from tkinter.colorchooser import askcolor

class PaintApp:
    def __init__(self, root):
        self.root = root
        self.root.title("画图软件")

        self.pen_button = Radiobutton(self.root, text='画笔', command=self.use_pen)
        self.pen_button.grid(row=0, column=0)

        self.color_button = Button(self.root, text='颜色', command=self.choose_color)
        self.color_button.grid(row=0, column=1)

        self.eraser_button = Radiobutton(self.root, text='橡皮擦', command=self.use_eraser)
        self.eraser_button.grid(row=0, column=2)

        self.canvas = Canvas(self.root, bg='white', width=600, height=400)
        self.canvas.grid(row=1, columnspan=3)

        self.setup()

    def setup(self):
        self.old_x, self.old_y = None, None
        self.line_width = 5
        self.color = 'black'
        self.eraser_on = False
        self.active_button = self.pen_button
        self.canvas.bind('<B1-Motion>', self.paint)
        self.canvas.bind('<ButtonRelease-1>', self.reset)

    def use_pen(self):
        self.activate_button(self.pen_button)

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

    def use_eraser(self):
        self.activate_button(self.eraser_button, eraser_mode=True)

    def activate_button(self, button, eraser_mode=False):
        self.active_button.config(relief=RAISED)
        button.config(relief=SUNKEN)
        self.active_button = button
        self.eraser_on = eraser_mode

    def paint(self, event):
        if self.eraser_on:
            self.canvas.create_rectangle(event.x - 10, event.y - 10, event.x + 10, event.y + 10, fill='white', outline='white')
        else:
            if self.old_x and self.old_y:
                self.canvas.create_line(self.old_x, self.old_y, event.x, event.y, width=self.line_width, fill=self.color, capstyle=ROUND, smooth=TRUE, splinesteps=36)
        self.old_x = event.x
        self.old_y = event.y

    def reset(self, event):
        self.old_x, self.old_y = None, None

if __name__ == '__main__':
    root = Tk()
    PaintApp(root)
    root.mainloop()

这个画图软件包含了画笔、橡皮擦和颜色选择三个功能，同时支持撤销操作。您可以通过改变代码来实现其他画图功能，比如画直线、矩形、圆等。