一、Label、Button和Scale控件
from tkinter import*
def resize(ev=None):
label.config(font='Helvetica %d bold' %scale.get())
root = Tk()
root.geometry('250x150') #should use x instead of 250*150
label = Label(root, text='new GUI')
scale = Scale(root, from_=10, to=40, orient=HORIZONTAL, command=resize)
scale.set(12)
button = Button(root, text='quit', command=root.quit)
label.pack(fill=Y, expand=1)
button.pack() #fill 参数告诉 Packer 让 QUIT
#按钮占据剩余的水平空间,而 expand 参数则会引导它填充整个水平可视空间
scale.pack(fill=X, expand=1)
mainloop()