单选按钮未设置值

Question

我正在制作一个文本编辑程序，但是当我运行这个代码它不起作用，因为在第 13 行，selecfont.get() 没有返回任何值。我不知道这是否与 for 循环有关，但我无法修复它我在另一个程序上遇到了类似的问题。谢谢

from tkinter import *
from os import listdir
from os import path
from threading import Thread

def open():
    print("open selected")

def save():
    print("save selected")

def fontchange():
    sheet.config(font = (str(selecfont.get())))
    print(selecfont.get())

fonts = ["Arial","Courier New","Times New Roman","Verdana",
"System","Impact","Fixedsys","corbel"]
master = Tk()
master.config(bg =  "#080d31")
master.title("Ed.co")

menubar = Menu(master,background = "#080d31")

filemenu = Menu(menubar,tearoff=0)
filemenu.add_command(label = "open",command = open)
filemenu.add_command(label = "save",command = save)
menubar.add_cascade(label = "file",menu = filemenu)

settingsmenu = Menu(menubar,tearoff=0)
fontmenu = Menu(settingsmenu,tearoff=0)
settingsmenu.add_cascade(label = "font",menu = fontmenu)
menubar.add_cascade(label = "settings",menu = settingsmenu)
for font in fonts:
        selecfont = StringVar()
        fontmenu.add_radiobutton(value = font,label = font,variable =       selecfont,command = fontchange)

sheet = Text(master,width = 71,height = 15,font = "corbel")
sheet.grid(row=1,column=0,columnspan = 3)

master.config(menu = menubar)
master.mainloop()

错误信息：

sheet.config(font = (str(selecfont.get())))
  File "C:\Python34\lib\tkinter\__init__.py", line 1319, in configure
    return self._configure('configure', cnf, kw)
  File "C:\Python34\lib\tkinter\__init__.py", line 1310, in _configure
    self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: font "" doesn't exist

Answer 1

单选按钮需要共享一个公共变量，但您正在为每个单选按钮创建一个新变量。您需要将 selecFont 的定义移到循环之外：

selecFont = StringVar()
for font in fonts:
    ...

单选按钮未设置值

radiobutton not setting value

tkinter

radio-button

python-3.x