Python-сообщество

roll_pages=2
current_roll_page=[1]  
def move_right(event):
    if current_roll_page[0]!=roll_pages:
        f=open('db','r')
        lenght=len(f.readlines())
        if (ceil(lenght/20)):
            for j in range(int(con.roll_width/10)):
                for i in range(1,41):
                    roll.update()
                    roll.move(i,-10,0)
                sleep(0.002)
        current_roll_page[0]+=1
        print(current_roll_page[0])
    return current_roll_page[0]
root.bind('<Left>',move_right)

import tkinter
class MyCanvas(tkinter.Canvas):
    def __init__(self,root,width=10,height=10,bg='black',**kwargs):
        super().__init__(root,width=width,height=height,bg=bg,**kwargs)
class MyBut():
    def __init__(self,my_canvas,x=10,y=10,text='',fill='black',font='arial 10',bg='white'):
        self.my_canvas=my_canvas
        self.text=text
        self.x=x
        self.y=y
        self.bg=bg
        self.font=font
        self.fill=fill
        f_width=font.split(' ')
        f_width=int(f_width[1])
        t_width=len(self.text)
        self.rect_height=f_width*2
        self.rect_width=t_width*f_width-(t_width*2)
        self.text_x=x+(self.rect_width/2)
        self.text_y=y+(self.rect_height/2)
        self.rect_ret=self.rect()
        self.txt_ret=self.txt()
        my_canvas.tag_bind(self.rect_ret,'<ButtonPress-1>',self.clickOn)
        my_canvas.tag_bind(self.txt_ret,'<ButtonPress-1>',self.clickOn)
        my_canvas.tag_bind(self.rect_ret,'<ButtonRelease-1>',self.clickOff)
        my_canvas.tag_bind(self.txt_ret,'<ButtonRelease-1>',self.clickOff)
    def rect(self):
        return my_canvas.create_rectangle(self.x,self.y,self.x+self.rect_width,self.y+self.rect_height,fill=self.bg)
    def txt(self):
        return my_canvas.create_text(self.text_x,self.text_y,text=self.text,font=self.font,anchor='center',fill=self.fill)
    def clickOn(self,event):
        my_canvas.itemconfigure(self.rect_ret,fill=self.fill)
        my_canvas.itemconfigure(self.txt_ret,fill=self.bg)
    def clickOff(self,event):
        my_canvas.itemconfigure(self.rect_ret,fill=self.bg)
        my_canvas.itemconfigure(self.txt_ret,fill=self.fill)
        return my_canvas.itemcget(self.txt_ret,option='text')
if __name__ == '__main__':
    root = tkinter.Tk()
    my_canvas=MyCanvas(root,600,500,bg='green')
    my_rect=MyBut(my_canvas,text='Hello World',fill='seagreen',bg='orange',font='arial 14')
    my_canvas.pack()
    root.mainloop()