How to use python controls

Label, button Buttn, and input box Entry are all python controls, so how to use them?

Label: can display text and bitmaps

from tkinter import *
root = Tk()
root.minsize(300, 200)
text = " I want to study PYTHON"
label = Label(root, text = text, fg ="black", bg="red")
label.pack(side = LEFT)
root.mainloop()

tkinter is a built-in GUI tool in Python module in which various controls are defined. Applications that program window interactions need to be imported.

root = Tk() generates a bottom window. Then define the object of the Label class, with the necessary parameters: parent space and text content. After defining the space, you must use the pack() function to ensure that it can be displayed. The last line root.mainloop() is necessary. It causes the root space to enter the main loop, start monitoring events and execute corresponding human-computer interaction commands.

Button Button: Display the button in the program.

from tkinter import *
root = Tk()
root.title("Button demo")
root.minsize (300, 200)
Button(root, text = "禁用" ,state = DISABLED).pack(side=LEFT)
Button(root, text = "取消" ).pack(side=LEFT)
Button(root, text = "确定" ).pack(side=LEFT)
Button(root, text = "退出" , command= root.quit).pack(side=RIGHT)
root.mainloop()

To disable the button, the visible parameter state = DISABLED will be available by default if it is not visible.

DISABLED is a predefined constant for tkinter values. state and the previous text= are both

variable names in the purchase function of the control, regardless of any changes, root is not.

Input box Entry: used to display simple text content

from tkinter import *
root = Tk()
root.title("Entry demo")
root.minsize (400, 200)
f1 = Frame(root)
f2 = Frame(root)
e1 = StringVar()
e1.set("输入框默认内容")
e2 = StringVar()
e2.set("不可修改的内容")
Label(f1, text="标准输入框").pack(side=LEFT, padx=5, pady=5)
Entry (f1, width = 20, textvariable = e1).pack(side=LEFT)
Label(f2, text="禁用输入框").pack(side=LEFT, padx=5, pady=5)
Entry(f2, width = 20, textvariable = e2, state=DISABLED).pack(side=LEFT)
f1.pack()
f2.pack()
root.mainloop()

The input box is a single-line text box. Entry has a parameter textvariable which is the string displayed in the text box.

Use the StringVar() function to define a string variable with a certain type but no value assignment.

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