如何使用python写截屏小工具

import pyautogui

root = tk.Tk()
root.overrideredirect(True)  # 隐藏窗口的标题栏
root.attributes("-alpha", 0.1) # 窗口透明度10%
root.geometry("{0}x{1}+0+0".format(root.winfo_screenwidth(), root.winfo_screenheight()))
root.configure(bg="black")
注：alhpa参数用于设定透明度；geometry函数用于设定窗口大小；
创建一个子窗口，用于显示框选区域：

# 再创建1个Canvas用于圈选
cv = tk.Canvas(root)
x, y = 0, 0
xstart,ystart = 0 ,0
xend,yend = 0, 0
rec = ''

# 再创建1个Canvas用于圈选
cv = tk.Canvas(root)
x, y = 0, 0
xstart,ystart = 0 ,0
xend,yend = 0, 0
rec = ''

canvas = tk.Canvas(root)
canvas.configure(width=300)
canvas.configure(height=100)
canvas.configure(bg="yellow")
canvas.configure(highlightthickness=0) # 高亮厚度
canvas.place(x=(root.winfo_screenwidth()-500),y=(root.winfo_screenheight()-300))
canvas.create_text(150, 50,font='Arial -20 bold',text='ESC退出，假装工具条')
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# 绑定事件
canvas.bind("<B1-Motion>", move) # 鼠标左键移动->显示当前光标位置
root.bind('<Escape>',sys_out) # 键盘Esc键->退出
root.bind("<Button-1>", button_1) # 鼠标左键点击->显示子窗口 
root.bind("<B1-Motion>", b1_Motion)# 鼠标左键移动->改变子窗口大小
root.bind("<ButtonRelease-1>", buttonRelease_1) # 鼠标左键释放->记录最后光标的位置
root.bind("<Button-3>",button_3) #鼠标右键点击->截屏并保存图片
root.mainloop()

def move(event):
 global x, y ,xstart,ystart
 new_x = (event.x-x)+canvas.winfo_x()
 new_y = (event.y-y)+canvas.winfo_y()
 s = "300x200+" + str(new_x)+"+" + str(new_y) 
 canvas.place(x = new_x - xstart,y = new_y -ystart) 
 print("s = ", s)
 print(root.winfo_x(), root.winfo_y())
 print(event.x, event.y)

def button_1(event):
 global x, y ,xstart,ystart
 global rec
 x, y = event.x, event.y
 xstart,ystart = event.x, event.y
 print("event.x, event.y = ", event.x, event.y)
 xstart,ystart = event.x, event.y 
 cv.configure(height=1)
 cv.configure(width=1)
 cv.config(highlightthickness=0) # 无边框
 cv.place(x=event.x, y=event.y)
 rec = cv.create_rectangle(0,0,0,0,outline='red',width=8,dash=(4, 4))

def b1_Motion(event):
 global x, y,xstart,ystart
 x, y = event.x, event.y
 print("event.x, event.y = ", event.x, event.y)
 cv.configure(height = event.y - ystart)
 cv.configure(width = event.x - xstart)
 cv.coords(rec,0,0,event.x-xstart,event.y-ystart)

def buttonRelease_1(event):
 global xend,yend
 xend, yend = event.x, event.y

def button_3(event):
 global xstart,ystart,xend,yend
 cv.delete(rec)
 cv.place_forget()
 img = pyautogui.screenshot(region=[xstart,ystart,xend-xstart,yend-ystart]) # x,y,w,h
 img.save('screenshot.png')
 sys_out(None)

def sys_out(even):
 root.destroy()