python - 按下按钮后可以更改菜单栏文本吗？（Python，tkinter）
问题描述
一个月前我开始使用 python，我正在练习不同的东西。现在我正在构建一个计算器，并在 menubar 上添加一个日/夜模式开关。那很简单。但我希望我的菜单栏在夜间模式下仅显示“白天模式”选项，反之亦然。 尝试了几件事（例如为“add_command”使用变量，然后尝试执行“variable.config()”）但没有奏效。这样的事情可以做吗？
我希望我已经足够好地解释了自己。对不起，如果我的英语不太好。这是一段代码：
def mododia():
seguro=messagebox.askquestion("Blah blah", "Blah blah blah")
if seguro=="yes":
File.config(background="white", fg="blue")
Edit.config(background="white", fg="blue")
Help.config(background="white", fg="blue")
[...]
def modonoche():
messagebox.showinfo("Blah blah", "Blah blah blah")
File.config(background="black", fg="orange")
Edit.config(background="black", fg="orange")
Help.config(background="black", fg="orange")
[...]
Edit=Menu(tools, tearoff=0, background="black", fg="orange")
tools.add_cascade(label="Edit", menu=Edit)
Edit.add_command(label="Modo día", command=mododia)
Edit.add_command(label="Modo noche", command=modonoche)
编辑以添加可重现的示例：
from tkinter import *
from tkinter import messagebox
root=Tk()
root.resizable(width=0, height=0)
def mododia():
seguro=messagebox.askquestion("Activar modo día", "Se recomienda no utilizar este modo con poca luz. ¿Está seguro de querer activar el modo día?")
if seguro=="yes":
File.config(background="white", fg="blue")
Edit.config(background="white", fg="blue")
Help.config(background="white", fg="blue")
frame1.config(bg="white")
frame2.config(bg="white")
previous.config(bg="white")
previouseq.config(bg="white")
display.config(bg="white", fg="black")
current.config(bg="white")
butclear.config(bg="white", fg="blue")
butdelete.config(bg="white", fg="blue")
butpercen.config(bg="white", fg="blue")
butdivide.config(bg="white", fg="blue")
but7.config(bg="white", fg="black")
but8.config(bg="white", fg="black")
but9.config(bg="white", fg="black")
butmulti.config(bg="white", fg="blue")
but4.config(bg="white", fg="black")
but5.config(bg="white", fg="black")
but6.config(bg="white", fg="black")
butsubs.config(bg="white", fg="blue")
but1.config(bg="white", fg="black")
but2.config(bg="white", fg="black")
but3.config(bg="white", fg="black")
butadd.config(bg="white", fg="blue")
butpotency.config(bg="white", fg="blue")
but0.config(bg="white", fg="black")
butdot.config(bg="white", fg="black")
butequal.config(bg="blue", fg="white")
root.config(bg="white")
def modonoche():
messagebox.showinfo("Activar modo noche", "Esta es la configuración recomendada por el creador del programa.")
File.config(background="black", fg="orange")
Edit.config(background="black", fg="orange")
Help.config(background="black", fg="orange")
frame1.config(bg="black")
frame2.config(bg="black")
previous.config(bg="black")
previouseq.config(bg="black")
display.config(bg="black", fg="white")
current.config(bg="black")
butclear.config(bg="black", fg="orange")
butdelete.config(bg="black", fg="orange")
butpercen.config(bg="black", fg="orange")
butdivide.config(bg="black", fg="orange")
but7.config(bg="black", fg="white")
but8.config(bg="black", fg="white")
but9.config(bg="black", fg="white")
butmulti.config(bg="black", fg="orange")
but4.config(bg="black", fg="white")
but5.config(bg="black", fg="white")
but6.config(bg="black", fg="white")
butsubs.config(bg="black", fg="orange")
but1.config(bg="black", fg="white")
but2.config(bg="black", fg="white")
but3.config(bg="black", fg="white")
butadd.config(bg="black", fg="orange")
butpotency.config(bg="black", fg="orange")
but0.config(bg="black", fg="white")
butdot.config(bg="black", fg="white")
butequal.config(bg="orange", fg="white")
root.config(bg="black")
def helpme():
ayuda=messagebox.showinfo("Ayuda", "Pulse las cifras con las que desea operar y las operaciones a realizar como en una calculadora corriente.")
def about():
acercade=messagebox.showinfo("Calculadora 1.0", "Primera versión de calculadora creada por Shinington.")
def exit():
salir=messagebox.askquestion("Cerrar calculadora", "¿Seguro que desea salir?")
if salir=="yes":
root.destroy()
def erase():
inputdis.set(0)
inputcurr.set(0)
def new():
erase()
inputprev.set(0)
inputpreq.set(0)
tools=Menu(root)
File=Menu(tools, tearoff=0, background="black", fg="orange")
tools.add_cascade(label="File", menu=File)
File.add_command(label="Nuevo", command=new)
File.add_command(label="Borrar", command=erase)
File.add_separator()
File.add_command(label="Salir", command=exit)
Edit=Menu(tools, tearoff=0, background="black", fg="orange")
tools.add_cascade(label="Edit", menu=Edit)
Edit.add_command(label="Modo día", command=mododia)
Edit.add_command(label="Modo noche", command=modonoche)
Help=Menu(tools, tearoff=0, background="black", fg="orange")
tools.add_cascade(label="Help", menu=Help)
Help.add_command(label="Ayuda", command=helpme)
Help.add_command(label="Acerca de...", command=about)
root.config(bg="black", menu=tools)
frame1=Frame(root)
frame1.pack()
frame2=Frame(root)
frame2.pack()
frame1.config(bg="black", width=40, height=30)
frame2.config(bg="black", width=40, height=60)
inputdis=IntVar()
inputprev=IntVar()
inputpreq=IntVar()
inputcurr=IntVar()
previous=Entry(frame1, textvariable=inputprev)
previous.grid(row=0, column=0, sticky="e")
previous.config(fg="gray", bg="black", font=("", 8), width=40, justify="right", borderwidth=0)
previouseq=Entry(frame1, textvariable=inputpreq)
previouseq.grid(row=1, column=0, sticky="e")
previouseq.config(fg="gray", bg="black", font=("", 8), width=40, justify="right", borderwidth=0)
display=Entry(frame1, textvariable=inputdis)
display.grid(row=2, column=0, pady=10, sticky="e")
display.config(fg="white", bg="black", font=("", 12, "bold"), width=30, justify="right", borderwidth=0)
current=Entry(frame1, textvariable=inputcurr)
current.grid(row=3, column=0, pady=10, sticky="e")
current.config(fg="gray", bg="black", font=("", 8), width=40, justify="right", borderwidth=0)
butclear=Button(frame2, text="AC", width=7)
butclear.grid(row=0, column=0, padx=5, pady=10)
butclear.config(fg="orange", bg="black", font=("", 9, "bold"), borderwidth=0)
butdelete=Button(frame2, text="DEL", width=7)
butdelete.grid(row=0, column=1, padx=5, pady=10)
butdelete.config(fg="orange", bg="black", font=("", 9, "bold"), borderwidth=0)
butpercen=Button(frame2, text="%", width=7)
butpercen.grid(row=0, column=2, padx=5, pady=10)
butpercen.config(fg="orange", bg="black", font=("", 10, "bold"), borderwidth=0)
butdivide=Button(frame2, text=r"/", width=7)
butdivide.grid(row=0, column=3, padx=5, pady=10)
butdivide.config(fg="orange", bg="black", font=("", 10, "bold"), borderwidth=0)
but7=Button(frame2, text="7", width=7)
but7.grid(row=1, column=0, padx=5, pady=10)
but7.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
but8=Button(frame2, text="8", width=7)
but8.grid(row=1, column=1, padx=5, pady=10)
but8.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
but9=Button(frame2, text="9", width=7)
but9.grid(row=1, column=2, padx=5, pady=10)
but9.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
butmulti=Button(frame2, text="x", width=7)
butmulti.grid(row=1, column=3, padx=5, pady=10)
butmulti.config(fg="orange", bg="black", font=("", 10, "bold"), borderwidth=0)
but4=Button(frame2, text="4", width=7)
but4.grid(row=2, column=0, padx=5, pady=10)
but4.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
but5=Button(frame2, text="5", width=7)
but5.grid(row=2, column=1, padx=5, pady=10)
but5.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
but6=Button(frame2, text="6", width=7)
but6.grid(row=2, column=2, padx=5, pady=10)
but6.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
butsubs=Button(frame2, text="-", width=7)
butsubs.grid(row=2, column=3, padx=5, pady=10)
butsubs.config(fg="orange", bg="black", font=("", 10, "bold"), borderwidth=0)
but1=Button(frame2, text="1", width=7)
but1.grid(row=3, column=0, padx=5, pady=10)
but1.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
but2=Button(frame2, text="2", width=7)
but2.grid(row=3, column=1, padx=5, pady=10)
but2.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
but3=Button(frame2, text="3", width=7)
but3.grid(row=3, column=2, padx=5, pady=10)
but3.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
butadd=Button(frame2, text="+", width=7)
butadd.grid(row=3, column=3, padx=5, pady=10)
butadd.config(fg="orange", bg="black", font=("", 10, "bold"), borderwidth=0)
butpotency=Button(frame2, text="x^", width=7)
butpotency.grid(row=4, column=0, padx=5, pady=10)
butpotency.config(fg="orange", bg="black", font=("", 10, "bold"), borderwidth=0)
but0=Button(frame2, text="0", width=7)
but0.grid(row=4, column=1, padx=5, pady=10)
but0.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
butdot=Button(frame2, text=".", width=7)
butdot.grid(row=4, column=2, padx=5, pady=10)
butdot.config(fg="white", bg="black", font=("", 10, "bold"), borderwidth=0)
butequal=Button(frame2, text="=", width=7)
butequal.grid(row=4, column=3, padx=5, pady=10)
butequal.config(fg="white", bg="orange", font=("", 10, "bold"), borderwidth=0)
root.mainloop()
在那里你可以在“modo día”（白天模式）和“modo noche”（夜间模式）之间切换，但我希望菜单栏上只有一个选项可用（选择白天模式时的夜间模式，反之亦然）。
我不希望它随着时间的推移而自动更改，而是使用菜单栏手动更改它。这可以通过 Bryan Oakley 谈到的 entryconfigure 来完成吗？我也不知道 Flags Cool Cloud 的提及。正如我所说，我几周前就开始编程了。
解决方案
删除这一行：
Edit.add_command(label="Modo noche", command=modonoche)
将这两行添加到您的代码中：
def modonoche():
...
Edit.entryconfigure(0,label='mododia',command=mododia)
def mododia():
seguro=messagebox.askquestion("Activar modo día", "Se recomienda no utilizar este modo con poca luz. ¿Está seguro de querer activar el modo día?")
if seguro=="yes":
...
Edit.entryconfigure(0,label='modonoche',command=modonoche)
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