python - Tkinter: Addressing Label widget created by for loop

Question

The following is my script. Basically, it will ask the user to input a number into the Entry box. Once the user enter a number and click OK, it will give you combination of Labels+Buttons depends on the number that user typed in to the Entry box.

from Tkinter import *

root=Tk()

sizex = 600
sizey = 400
posx  = 0
posy  = 0
root.wm_geometry("%dx%d+%d+%d" % (sizex, sizey, posx, posy))

def myClick():
    myframe=Frame(root,width=400,height=300,bd=2,relief=GROOVE)
    myframe.place(x=10,y=10)
    x=myvalue.get()
    value=int(x)
    for i in range(value):
        Mylabel=Label(myframe,text=" mytext "+str(i)).place(x=10,y=10+(30*i))
        Button(myframe,text="Accept").place(x=70,y=10+(30*i))

mybutton=Button(root,text="OK",command=myClick)
mybutton.place(x=420,y=10)

myvalue=Entry(root)
myvalue.place(x=450,y=10)

root.mainloop()

Normally, when i create a label widget, i would do something like this

mylabel=Label(root,text='mylabel')
mylabel.pack()

So when i want to change the text of my label later on i can just simply do this

mylabel.config(text='new text')

But now, since i am using for loop to create all labels at once, is there anyway to address the individual labels after the labels has been created? For example, the user typed in '5' into the entry box and the program will give me 5 lables + 5 buttons. Is there anyway for me to change the properties (ie, label.config(..)) of the individual labels?

Answer 1

Sure! Just make a list of labels, call place on each one, and then you can reference them later and change their values. Like so:

from Tkinter import *

root=Tk()

sizex = 600
sizey = 400
posx  = 0
posy  = 0
root.wm_geometry("%dx%d+%d+%d" % (sizex, sizey, posx, posy))

labels = []

def myClick():
    del labels[:] # remove any previous labels from if the callback was called before
    myframe=Frame(root,width=400,height=300,bd=2,relief=GROOVE)
    myframe.place(x=10,y=10)
    x=myvalue.get()
    value=int(x)
    for i in range(value):
        labels.append(Label(myframe,text=" mytext "+str(i)))
        labels[i].place(x=10,y=10+(30*i))
        Button(myframe,text="Accept").place(x=70,y=10+(30*i))

def myClick2():
    if len(labels) > 0:
        labels[0].config(text="Click2!")
    if len(labels) > 1:
        labels[1].config(text="Click2!!")

mybutton=Button(root,text="OK",command=myClick)
mybutton.place(x=420,y=10)

mybutton2=Button(root,text="Change",command=myClick2)
mybutton2.place(x=420,y=80)

myvalue=Entry(root)
myvalue.place(x=450,y=10)

root.mainloop()

Also note! In the assignment Mylabel=Label(myframe,text=" mytext "+str(i)).place(x=10,y=10+(30*i)) in the original code, that call sets Mylabel to None, since the place method returns None. You want to separate the place call into its own line, like in the code above.