tkinter:获取标签小部件以显示输出

Question

我有一个GUI，有两个输入框：一个用于“上次换油时的里程”，另一个用于“当前里程”。有一个按钮，点击后，运行一个函数，从输入框中读取输入，并打印我到期或过期的英里数等。我希望将输出显示到GUI。我知道我必须创建一个标签小部件，但我如何使它在按下按钮并调用函数时，标签文本用函数中的信息更新

from tkinter import *
from tkinter import ttk


#initializing root window
root = Tk()
root.title("Car Maintenance App")

#functions
miles = IntVar()
last_miles = IntVar()

def check_oil_change():
    miles = miles_entry.get()
    miles = int(miles)
    last_miles = lastmiles_entry.get()
    last_miles = int(last_miles)
    miles_till_oilchange = 3000 - (miles - last_miles)
    if miles_till_oilchange == 0:
        print("You are due for an oil change")
    if miles_till_oilchange > 0:
        print("You have {} miles until next oil change.".format(miles_till_oilchange))
    if miles_till_oilchange < 0:
        print("You are over due {} miles for an oil change.".format(abs(miles_till_oilchange)))

#creating container for widgets
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

#widgets
milesLabel = ttk.Label(mainframe, text= "Enter your cars current mileage:")
lastmilesLabel = ttk.Label(mainframe, text= "How many miles was your last oil change at?")

miles_entry = ttk.Entry(mainframe, width=7)
lastmiles_entry = ttk.Entry(mainframe, width=7)

milesButton = ttk.Button(mainframe, text="Enter", command=check_oil_change)

#positioning
milesLabel.grid(row=1, column=0)
miles_entry.grid(row=1, column=1)
milesButton.grid(row=1, column=2)
lastmilesLabel.grid(row=0, column=0)
lastmiles_entry.grid(row=0, column=1)

root.mainloop()

Answer 1

在这种情况下，您需要定义一个标签，并使用.config()方法

.config()方法允许您配置指定的小部件。您可以编辑小部件的任何参数

from tkinter import *
from tkinter import ttk

#initializing root window
root = Tk()
root.title("Car Maintenance App")

#functions
miles = IntVar()
last_miles = IntVar()

def check_oil_change():
    miles = miles_entry.get()
    miles = int(miles)
    last_miles = lastmiles_entry.get()
    last_miles = int(last_miles)
    miles_till_oilchange = 3000 - (miles - last_miles)

    if miles_till_oilchange == 0:
        mile_lbl.config(text="You are due for an oil change")

    elif miles_till_oilchange > 0:
        mile_lbl.config(text="You have {} miles until next oil change.".format(miles_till_oilchange))

    elif miles_till_oilchange < 0:
        mile_lbl.config(text="You are over due {} miles for an oil change.".format(abs(miles_till_oilchange)))



#creating container for widgets
mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

#widgets
milesLabel = ttk.Label(mainframe, text= "Enter your cars current mileage:")
lastmilesLabel = ttk.Label(mainframe, text= "How many miles was your last oil change at?")

miles_entry = ttk.Entry(mainframe, width=7)
lastmiles_entry = ttk.Entry(mainframe, width=7)

milesButton = ttk.Button(mainframe, text="Enter", command=check_oil_change)
mile_lbl=Label(mainframe,font=("arial","bold"))

#positioning
milesLabel.grid(row=1, column=0)
miles_entry.grid(row=1, column=1)
milesButton.grid(row=1, column=2)
mile_lbl.grid(row=2,column=0)
lastmilesLabel.grid(row=0, column=0)
lastmiles_entry.grid(row=0, column=1)

root.mainloop()