Python GUI 標籤 Label ---- EX2.1 , 2.2 , 2.2.1

 # ch2_1.py

from tkinter import *

root = Tk()

root.title("ch2_1")

label=Label(root,text="I like tkinter")

label.pack()        # 包裝與定位元件

print(type(label))  # 傳回Label物件

root.mainloop()

# ch2_2.py

from tkinter import *

root = Tk()

root.title("ch2_2")

label=Label(root,text="I like tkinter").pack()

print(type(label))  # 傳回Label物件

root.mainloop()

>>> %Run ch2_2.py

<class 'NoneType'>

# ch2_2_1.py

from tkinter import *

root = Tk()

root.title("ch2_2_1")

Label(root,text="I like tkinter").pack()  

root.mainloop()