[英]Tkinter Checkbutton doesn't change my variable
I'm trying to use a Checkbutton with a function, my_var never changes but it always call my function. 我正在尝试使用带有函数的Checkbutton,my_var永远不会改变,但它总是调用我的函数。
here the code: 这里的代码:
my_var = False
def controllo_carta():
global my_var
print str(my_var)
[...]
c = tk.Checkbutton(toolbar, text="press me",onvalue=True,offvalue=False,variable=my_var,command=controllo_carta)
c.select()
c.pack(side=tk.LEFT,padx=2,pady=2)
print 'my var:' + str(my_var)
[...]
where is my mistake? 我的错在哪里?
thanks! 谢谢!
To make your code work I would use BooleanVar() and the associated get() method to retrieve its value ( http://effbot.org/tkinterbook/variable.htm ) 为了使你的代码工作,我将使用BooleanVar()和相关的get()方法来检索它的值( http://effbot.org/tkinterbook/variable.htm )
For example: (from: http://effbot.org/tkinterbook/checkbutton.htm ) 例如:(来自: http : //effbot.org/tkinterbook/checkbutton.htm )
from Tkinter import *
master = Tk()
var = BooleanVar()
def cb():
print "variable is {0}".format(var.get())
c = Checkbutton(master, text="Press me", variable=var, command=cb)
c.pack()
mainloop()
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