存储变量对象的位置(StringVar,v,在您的情况下)必须保持不变,以便这种奇怪的行为不会出现.我的猜测是我们看到这种行为因为v超出了范围,出了问题.除了使用全局之外,我无法想到从函数中执行此操作的方法.
破码：
from Tkinter import *
def App(master):
v = StringVar()
v.set('python')
lable1 = Label(master, text=' hovering over below radio buttons will cause them to look like they are selected')
lable1.pack()
runtimeFrame = Frame(master, relief=GROOVE, borderwidth=3)
runtimeFrame.pack(fill=X, pady=5, padx=5)
for mode in ['java', 'python', 'jython']:
b = Radiobutton(runtimeFrame, text=mode, variable=v, value=mode, indicatoron=1)
b.pack(side=LEFT)
if __name__ == '__main__':
master = Tk()
App(master)
mainloop()
示例修复：
from Tkinter import *
def App(master, radio_var):
radio_var.set('python')
lable1 = Label(master, text=' hovering over below radio buttons will cause them to look like they are selected')
lable1.pack()
runtimeFrame = Frame(master, relief=GROOVE, borderwidth=3)
runtimeFrame.pack(fill=X, pady=5, padx=5)
for mode in ['java', 'python', 'jython']:
b = Radiobutton(runtimeFrame, text=mode, variable=radio_var, value=mode, indicatoron=1)
b.pack(side=LEFT)
if __name__ == '__main__':
master = Tk()
radio_var = StringVar()
App(master, radio_var)
mainloop()
考虑一下,如果你有多个需要持久化的变量,你可以传入一个变量列表或字典.
此外,如果“必须在函数中”是作业分配要求,请考虑将代码包装在类中.我不是tk专家,但这似乎是组织代码的首选方式.
示例修复2：
from Tkinter import *
class App(object):
def __init__(self, master):
self.radio_var = StringVar()
self.radio_var.set('python')
lable1 = Label(master, text=' hovering over below radio buttons will cause them to look like they are selected')
lable1.pack()
runtimeFrame = Frame(master, relief=GROOVE, borderwidth=3)
runtimeFrame.pack(fill=X, pady=5, padx=5)
for mode in ['java', 'python', 'jython']:
b = Radiobutton(runtimeFrame, text=mode, variable=self.radio_var, value=mode, indicatoron=1)
b.pack(side=LEFT)
if __name__ == '__main__':
master = Tk()
app = App(master)
mainloop()
注意一个微小的变化
app = App(master)
这是必需的,以便App实例不会过早地进行垃圾回收.这将有效地将self.radio_var拉出范围,我们又回到了第一个方向.
