Python tkinter 学习记录(一) --label 与 button

from tkinter import *

root = Tk()
# 创建一个Tk实例
root.wm_title("标题")
# 修改标题
root.mainloop()
# 进入root的事件循环

from tkinter import *

root = Tk()
root.wm_title("标题")
w1 = Label(root, text="~~~~~~1号标签~~~~~~")
w2 = Label(root, text="~~~~~~2号标签~~~~~~")
w3 = Label(root, text="~~~~~~3号标签~~~~~~")
w4 = Label(root, text="~~~~~~4号标签~~~~~~")

w1.pack()

w4.pack()
w3.pack()


root.mainloop()

>>> from tkinter import *
>>> help(Label.__init__)
Help on function __init__ in module tkinter:

__init__(self, master=None, cnf={}, **kw)
    Construct a label widget with the parent MASTER.
    
    STANDARD OPTIONS
    
        activebackground, activeforeground, anchor,
        background, bitmap, borderwidth, cursor,
        disabledforeground, font, foreground,
        highlightbackground, highlightcolor,
        highlightthickness, image, justify,
        padx, pady, relief, takefocus, text,
        textvariable, underline, wraplength
    
    WIDGET-SPECIFIC OPTIONS
    
        height, state, width

from tkinter import *


def add_label():
    global root
    w = Label(text="一个新增的标签")
    w.pack()


root = Tk()
root.wm_title("one window")

b1 = Button(root, text="一个按钮", command=add_label)
b1.pack()

root.mainloop()

command=add_label     command属性 将是一个function对象
command=add_label()   command值为None 因为add_label没定义返回值
command="add_label"    command 是str对象

from tkinter import *


def add_label(event):
    global root
    w = Label(text="一个新增的标签"+str(event))
    w.pack()


root = Tk()
root.wm_title("one window")

b1 = Button(root, text="一个按钮")
b1.bind("<Button-1>", add_label)
b1.pack()

root.mainloop()

TypeError: add_label() takes 0 positional arguments but 1 was given