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tkinter GUI（燈光未顯示在我的窗口中）

Python

慕田峪9158850 2024-01-04 16:29:19

三個燈通過單選按鈕操作誰能幫我找出原因嗎？下面的代碼沒有給出錯誤，但沒有輸出:( 在我的根目錄上出現(xiàn)其他圖標(biāo)（此處不包括），但下面的代碼部分不起作用？from tkinter import *root = Tk()frame = Frame(root)frame.pack()color = StringVar() radio_red = Radiobutton(frame, text="Red", bg="red", variable= color, value="R", command= on_RadioChange) radio_red.grid(row=10, column=1) radio_yellow = Radiobutton(frame, text="Yellow", bg="yellow", variable= color, value="Y", command= on_RadioChange) radio_yellow.grid(row = 10, column = 2) radio_green = Radiobutton(frame, text="Green", bg="green", variable= color, value="G", command= on_RadioChange) radio_green.grid(row = 10, column = 3) canvas = Canvas(root, width=450, height=300, bg="white") canvas.pack() oval_red = canvas.create_oval(10, 10, 110, 110, fill="white") oval_yellow = canvas.create_oval(120, 10, 220, 110, fill="white") oval_green = canvas.create_oval(230, 10, 330, 110, fill="white") color.set('R') canvas.itemconfig(oval_red, fill="red") root.mainloop() def on_RadioChange(): color = color.get() if color == 'R': canvas.itemconfig(oval_red, fill="red") canvas.itemconfig(oval_yellow, fill="white") canvas.itemconfig(oval_green, fill="white") elif color == 'Y': canvas.itemconfig(oval_red, fill="white") canvas.itemconfig(oval_yellow, fill="yellow") canvas.itemconfig(oval_green, fill="white") elif color == 'G': canvas.itemconfig(oval_red, fill="white") canvas.itemconfig(oval_yellow, fill="white") canvas.itemconfig(oval_green, fill="green")

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1 回答

智慧大石

TA貢獻(xiàn)1946條經(jīng)驗獲得超3個贊

您可能應(yīng)該了解如何使用類，但這里有一個有關(guān)如何在給定代碼中使用類的示例。

from tkinter import *

class TrafficLights:

def value(self):

root = Tk()

frame = Frame(root)

frame.pack()

self.color = StringVar()

radio_red = Radiobutton(frame, text="Red", bg="red", variable= self.color, value="R", command= self.on_RadioChange)

radio_red.grid(row=10, column=1)

radio_yellow = Radiobutton(frame, text="Yellow", bg="yellow", variable= self.color, value="Y", command= self.on_RadioChange)

radio_yellow.grid(row = 10, column = 2)

radio_green = Radiobutton(frame, text="Green", bg="green", variable= self.color, value="G", command= self.on_RadioChange)

radio_green.grid(row = 10, column = 3)

self.canvas = Canvas(root, width=450, height=300, bg="white")

self.canvas.pack()

self.oval_red = self.canvas.create_oval(10, 10, 110, 110, fill="white")

self.oval_yellow = self.canvas.create_oval(120, 10, 220, 110, fill="white")

self.oval_green = self.canvas.create_oval(230, 10, 330, 110, fill="white")

self.color.set('R')

self.canvas.itemconfig(self.oval_red, fill="red")

root.mainloop()

def on_RadioChange(self):

color = self.color.get()

if color == 'R':

self.canvas.itemconfig(self.oval_red, fill="red")

self.canvas.itemconfig(self.oval_yellow, fill="white")

self.canvas.itemconfig(self.oval_green, fill="white")

elif color == 'Y':

self.canvas.itemconfig(self.oval_red, fill="white")

self.canvas.itemconfig(self.oval_yellow, fill="yellow")

self.canvas.itemconfig(self.oval_green, fill="white")

elif color == 'G':

self.canvas.itemconfig(self.oval_red, fill="white")

self.canvas.itemconfig(self.oval_yellow, fill="white")

self.canvas.itemconfig(self.oval_green, fill="green")

a = TrafficLights()

a.value()

主要錯誤是您沒有使用self也沒有調(diào)用該方法value()。所以我修復(fù)了所有這些。因此，如果您不想調(diào)用value()，那么您可以將 Changedef value(self)與 def 一起使用__init__(self):，這樣您現(xiàn)在就不必調(diào)用了a.value()。我建議您在繼續(xù)學(xué)習(xí) python 和 tkinter 課程之前先學(xué)習(xí)更多有關(guān) OOP 的知識。

更新：

沒有什么太大的問題，只是重新排列代碼并將color內(nèi)部函數(shù)更改為colors其他內(nèi)容，完成的代碼將是：

from tkinter import *

root = Tk()

def on_RadioChange():

colors = color.get()

if colors == 'R':

canvas.itemconfig('oval_red', fill="red")

canvas.itemconfig('oval_yellow', fill="white")

canvas.itemconfig('oval_green', fill="white")

elif colors == 'Y':

canvas.itemconfig('oval_red', fill="white")

canvas.itemconfig('oval_yellow', fill="yellow")

canvas.itemconfig('oval_green', fill="white")

elif colors == 'G':

canvas.itemconfig('oval_red', fill="white")

canvas.itemconfig('oval_yellow', fill="white")

canvas.itemconfig('oval_green', fill="green")

frame = Frame(root)

frame.pack()

color = StringVar()

radio_red = Radiobutton(frame, text="Red", bg="red", variable=color, value="R", command=on_RadioChange)

radio_red.grid(row=10, column=1)

radio_yellow = Radiobutton(frame, text="Yellow", bg="yellow", variable=color, value="Y", command=on_RadioChange)

radio_yellow.grid(row = 10, column = 2)

radio_green = Radiobutton(frame, text="Green", bg="green", variable=color, value="G", command=on_RadioChange)

radio_green.grid(row = 10, column = 3)

canvas = Canvas(root, width=450, height=300, bg="white")

canvas.pack()

canvas.create_oval(10, 10, 110, 110, fill="white",tag='oval_red')

canvas.create_oval(120, 10, 220, 110, fill="white",tag='oval_yellow')

canvas.create_oval(230, 10, 330, 110, fill="white",tag='oval_green')

color.set('R')

canvas.itemconfig('oval_red', fill="red")

root.mainloop()

為什么color要改為colors？當(dāng)您使用color實際引用colorwith時color，這會引發(fā)一個UnboundLocalError: local variable 'color' referenced before assignment（因為它在函數(shù)內(nèi)部？），因此要擺脫它，只需重命名（僅在這種情況下）。這是最好的方法嗎？我不這么認(rèn)為，您可以在這里刪除一些無用的變量。

反對回復(fù) 2024-01-04