Radiobutton在python中无法正常工作

Question

我在tkinter上工作python gui并尝试使用单元转换器。 最初，当我把光标放在较低的单选按钮时，它们会自动被选中，请任何人帮助我如何摆脱这个。

from Tkinter import *
import tkMessageBox

root=Tk()
root.wm_title("Measurement Converter")

def Distance():

    def sel():
        print var.get()  

    L1 = Label(root, text="Enter Value :",font=20)
    L1.grid(row=3,column=0,padx=(0,10),columnspan=2)
    E1=Entry(root,justify=CENTER,width=20).grid(row=3,column=1,padx=(0,0),ipady=10,ipadx=20)
    L2 = Label(root, text="units in-")
    L2.grid(row=4,column=1,padx=(0,0))
    var = IntVar()
    R1 = Radiobutton(root, text="Meter", variable=var, value=1,command=sel)
    R1.grid(row=4,column=1,padx=(120,0))
    R2 = Radiobutton(root, text="Km", variable=var, value=2,command=sel)
    R2.grid(row=4,column=1,padx=(240,0))
    R3 = Radiobutton(root, text="Feet", variable=var, value=3,command=sel)
    R3.grid(row=4,column=1,columnspan=2,padx=(100,0),pady=4) 

    L3 = Label(root, text="convert into-")
    L3.grid(row=5,column=1,padx=(0,0))
    var3 = IntVar()
    RB1 = Radiobutton(root, text="Meter", variable=var3, value=1,command=sel)
    RB1.grid(row=5,column=1,padx=(120,0))
    RB2 = Radiobutton(root, text="Km", variable=var3, value=2,command=sel)
    RB2.grid(row=5,column=1,padx=(240,0))
    RB3 = Radiobutton(root, text="Feet", variable=var3, value=3,command=sel)
    RB3.grid(row=5,column=1,columnspan=2,padx=(100,0),pady=5) 

label1=Label(root, text='Select any Button to convert it in other Unit',bg="green",fg="white",justify=CENTER,borderwidth=1,font=20,padx=20 )
label1.grid(pady=15,padx=(15,15),row=0,column=1)

buttontext1=StringVar()
button1=Button(root,textvariable=buttontext1,font=25,padx=5,pady=5,width=15,command=Distance,bg='#FF0000')
buttontext1.set("Distance")
button1.grid(row=1,column=0,padx=(100,00))

buttontext2=StringVar()
button2=Button(root,textvariable=buttontext2,font=25,padx=5,pady=5,width=15,command=Distance,bg='#66FF66')
buttontext2.set("Weight")
button2.grid(row=1,column=2,padx=(0,100))

buttontext3=StringVar()
button3=Button(root,textvariable=buttontext3,font=25,padx=5,pady=5,width=15,command=Distance,bg='#3399CC')
buttontext3.set("Temprature")
button3.grid(row=2,column=0,pady=50,padx=(100,0))

buttontext4=StringVar()
button4=Button(root,textvariable=buttontext4,font=25,padx=5,pady=5,width=15,command=Distance,bg='#CCFF00')
buttontext4.set("Volume")
button4.grid(row=2,column=2,padx=(0,100))


root.mainloop()

Answer 1

我没有时间，所以我很快就开发了这个。 这只是一个起点，肯定可以增强。 我更喜欢开发类，因此你可以将精细化代码与显示代码分开（你应该开发另一个类并在Gui的calc方法中实例化它）。 当您必须进行转换时，您必须查询self.radio“variable”以获取用户选择的选项。 如果您需要进一步的帮助，请询问。 我会尽快回答。

from Tkinter import *

class Calculate:
    def __init__(self):
        self.stuff = None #store here cosstants to do conversions...
    def convert1(self,startval):#,someother params to specify "from" and "to"):
        return startval#this is an identity just as example
    def convert2(self,startval):
        pass
    #...and so on...
class Gui:
    def __init__(self):
        self.root = Tk()
        self.c = Calculate()
        self.volumef = StringVar()
        self.volumef.set("C")
        self.volumet = StringVar()
        self.volumet.set("C")
        self.weightf = StringVar()
        self.weightf.set("K")
        self.weightt = StringVar()
        self.weightt.set("K")
        self.distancef = StringVar()
        self.distancef.set("M")
        self.distancet = StringVar()
        self.distancet.set("M")
        self.temperaturef = StringVar()
        self.temperaturef.set("C")
        self.temperaturet = StringVar()
        self.temperaturet.set("C")
        self.f3 = None
        self.f4 = None
        self.f5 = None
        self.DISTANCEMODES = [("Meter", "M"),
                              ("Km", "K"),
                              ("Feet", "F")       
                             ]
        self.VOLUMEMODES = [ ("cm^3","C"),
                             ("m^3","M"),
                             ("mm^3","MM")
                           ]
        self.TEMPERATUREMODE = [ ("Celsius","C"),
                                 ("Farenheit","H"),
                                 ("Kelvin","K")
                               ]
        self.WEIGHTMODE = [ ("Kg","K"),
                            ("g","G"),
                            ("mg","M")
                          ]
        self.root.title("Conversions")
        self.f1 = Frame(self.root,relief=SUNKEN)
        self.f1.pack()
        self.createWidgets()
        self.root.mainloop()


    def createWidgets(self):
        self.f1 = Frame(self.root)
        self.bd = Button(self.f1, text="Distance",command=self.distance,width=10)
        self.bd.pack(side=LEFT,padx=10,pady=10)

        self.bw = Button(self.f1, text="Weight",command=self.weight,width=10)
        self.bw.pack(side=LEFT,padx=10,pady=10)

        self.f1.pack()
        self.f2 = Frame(self.root)
        self.bt = Button(self.f2, text="Temperature",command=self.temperature,width=10)
        self.bt.pack(side=LEFT,padx=10,pady=10)

        self.bv = Button(self.f2, text="Volume",command=self.volume,width=10)
        self.bv.pack(side=LEFT,padx=10,pady=10)
        self.f2.pack()

    def convert(self,val):
        var = self.edit1.get()#get value

        if val==0:#choose what conversion applay
            #x = self.c.convert1(var,self.volumef,self.volumet)
            x = self.c.convert1(var)#do a conversion
            print "volume calc"
        elif val==1:
            x = self.c.convert1(var)#do a conversion
            print "weight calc"
        elif val==2:
            x = self.c.convert1(var)#do a conversion
            print "distance calc"
        elif val==3:
            x = self.c.convert1(var)#do a conversion
            print "temperature calc"           
        else:
            print "it should never happen, but u can trow an excepion"
            x=0 #to avoid a python s.f. as I don't trow/manage exceptions


        self.edit2.config(state=NORMAL)#set as normal to be able to edit
        self.edit2.delete(0,END)#delete previous content 
        self.edit2.insert(0,x)#add new content
        self.edit2.config(state=DISABLED)#do not allow user input
    def createRadio(self,fv,tv,cmdp,mode):#fromvariable,tovariable,commandparam,mode
        if self.f3 and self.f4 and self.f5:
            self.f3.pack_forget()
            self.f4.pack_forget()
            self.f5.pack_forget()
        #FROM:
        self.f3 = Frame(self.root)
        lbl = Label(self.f3,text="From:",width=8)
        lbl.pack(side=LEFT)
        for m_text,m_mode in mode:
            b = Radiobutton(self.f3,text=m_text,value=m_mode,variable=fv)
            b.pack(side=LEFT)
        self.edit1 = Entry(self.f3,width=10)
        self.edit1.pack(side=LEFT)
        self.f3.pack()
        #TO:
        self.f4 = Frame(self.root)
        lbl = Label(self.f4,text="To:",width=8)
        lbl.pack(side=LEFT)
        for m_text,m_mode in mode:
            b = Radiobutton(self.f4,text=m_text,value=m_mode,variable=tv)
            b.pack(side=LEFT)
        self.edit2 = Entry(self.f4,width=10)
        self.edit2.config(state=DISABLED)        
        self.edit2.pack(side=LEFT)
        self.f4.pack()
        self.f5 = Frame(self.root)
        self.btnCalc = Button(self.f5,text="Calc",command=lambda:self.convert(cmdp),width=10)
        self.btnCalc.pack()
        self.f5.pack()


    def volume(self):
        self.createRadio(self.volumef,self.volumet,0,self.VOLUMEMODES)

    def weight(self):
        self.createRadio(self.weightf,self.weightt,1,self.WEIGHTMODE)

    def distance(self):
        self.createRadio(self.distancef,self.distancet,2,self.DISTANCEMODES)

    def temperature(self):
        self.createRadio(self.temperaturef,self.temperaturet,3,self.TEMPERATUREMODE)

Gui()

[编辑]：好吧我修改了一下我的代码，现在它应该有更多的意义;）