Tkinter. Drop-down list and combo box

OptionMenu与Combobox

OptionMenu drop-down list

grammar

OptionMenu(parent object, options, *value)
*value is a series of drop-down lists

Simple application

from tkinter import *
from tkinter import messagebox
class Application(Frame):
    def __init__(self,master=None):
        super().__init__(master)
        self.master=master
        self.pack()
        self.createWidget()

    def createWidget(self):
        var=StringVar(root)
        self.optionmenu=OptionMenu(self,var,"离散数学","线性代数","计算机网络","大学英语","计算机组成原理").pack()
if __name__ == '__main__':
    root=Tk()
    root.geometry('300x200')
    root.title('萤火虫')
    app=Application(master=root)
    root.mainloop()

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Click once.

Because it is not convenient to use the above method when there are too many items, it is more appropriate to use tuples to build a list.

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The effect is the same.
Set the default options below.
Tuple variable name + index

Get the content of the option.
Use the get method learned earlier

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Click to confirm selection:

Combobox combo box

Simple application

from tkinter import *
from tkinter.ttk import *
class Application(Frame):
    def __init__(self,master=None):
        super().__init__(master)
        self.master=master
        self.pack()
        self.createWidget()

    def createWidget(self):
        data=("离散数学","线性代数","计算机网络","大学英语","计算机组成原理")
        self.var=StringVar(root)
        self.var.set(data[0])#也可使用self.var.current(0)
        self.cb=Combobox(self,textvariable=self.var,value=data).pack()
if __name__ == '__main__':
    root=Tk()
    root.geometry('300x200')
    root.title('萤火虫')
    app=Application(master=root)
    root.mainloop()

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Default discrete mathematics

Get current options

Click to confirm