[Tkinter-discuss] Filling a series of tk.Label

[Iain Day]

Great, thanks for that!

Iain

Michael O'Donnell wrote:
> Hi Madhu,
> 
> This is not in fact a Tkinter problem.
> 
> Try the following simplification of your code:
> 
> lbl = [[0]*2]*2
> for i in range(2):
>     for j in range(2):
>         lbl[i][j] = str(i)+str(j)
>         print ">", i, j, lbl[i][j], lbl
> print lbl
> 
> ------------------
> 
> The print statement within the loops shows that
> every time you change the first row of the "array",
> the other row changes as well.
> 
> Try substituting the first line for:
> 
> lbl=[[0,0], [0,0]]
> 
> 
> Then no problem, the code works as expected.
> 
> So, I cannot explain why, but your way fo initialising the
> 'array' (in fact, a list of lists), seems to make a list of
> lists where the lists are in fact the same list.
> (I have never used '*' with lists, this may be the
> problem.
> 
> Try instead an intialisation like:
> 
> x=[[0 for i in range(2)] for j in range(3)]
> 
> Mick
> 
> 
> 
> 
> 
> On Tue, Mar 17, 2009 at 8:44 PM, Madhu Subramaniam
> <madhu.subramaniam at gmail.com> wrote:
>> Iain,
>>
>> I made a small test program (Fairly new in Tkinter), i have not found the
>> solution but i came across something, maybe somebody can throw more light on
>> this ?
>>
>> Test Code (Active Python IDE 2.6 , Windows XP, Tkinter 8.4)
>>
>> import sys
>> import pdb
>> from Tkinter import *
>> headers='ll'
>> machines= 'zt'
>> lbl = [[0]*len(headers)]*len(machines)
>> flag=0
>> root = Tk()
>> for i in range(len(machines)):
>>    for j in range(len(headers)):
>>     lbl[i][j] = Label(root, text= str(i)+str(j), bg = 'red')
>>     lbl[i][j].grid(row=i, column=j, padx=10, pady =5)
>> print lbl # something that was noticed
>> #print lbl[0][1]
>> lbl[0][0].config(text= 'row=0, column=0') # changes the text in lbl [1] [0]
>> lbl[0][1].config(text= 'row=0, column=1') # changes the text in lbl [1] [0]
>> lbl[1][0].config(text= 'row=1, column=0')# overwrites the text in lbl [1]
>> [0]
>> lbl[1][1].config(text= 'row=1, column=1') # overwrites the text in lbl [1]
>> [0]
>> root.mainloop()
>>
>> OUTPUT
>>>>> [[<Tkinter.Label instance at 0x012B3B70>, <Tkinter.Label instance at
>>>>> 0x012B3AA8>], [<Tkinter.Label instance at 0x012B3B70>, <Tkinter.Label
>>>>> instance at 0x012B3AA8>]]
>> The instances generated in row wise are the same, but within a row they are
>> different...
>> something more can be learnt from that?? hmm, i got to leave now.
>>
>> Thanks
>> Madhu
>>
>> On Tue, Mar 17, 2009 at 9:55 AM, Michael O'Donnell <michael.odonnell at uam.es>
>> wrote:
>>> Iain,
>>>
>>>  You code is incomplete, the place where you create the Label widgets
>>> is not included. We need that to see the problem.
>>>
>>> Check the grid operation on each Label, in particular the row parameter.
>>>
>>> Also, do a print as each Label is gridded, to see if they all are
>>> actually created.
>>>
>>> Mick
>>>
>>> On Mon, Mar 16, 2009 at 10:50 PM, Iain Day
>>> <iain at day-online.org.uk.invalid> wrote:
>>>> Hi,
>>>>
>>>> I've written a short program which is supposed to populate a table
>>>> constructed from tk.Label widgets. It does this by looping over the
>>>> rows.
>>>> Unfortunately, it only seems to populate the final row. What am I doing
>>>> wrong?
>>>>
>>>> The code is:
>>>>
>>>> def updatedata():
>>>>    updatetime.delete(0, tk.END)
>>>>    for i in range(len(machines)):
>>>>        print machines[i]
>>>>        status = sshshowstat(machines[i])
>>>>
>>>>        for j in range(len(status)):
>>>>            param, value = status[j].split(': ')
>>>>
>>>>            for k in range(len(variables)):
>>>>                if re.match(variables[k], param) is None:
>>>>                    continue
>>>>                else:
>>>> #                    print i, value
>>>>                    if value in ('Acquiring', 'Regulated'):
>>>>                        systemdata[i][k].config(text=value,
>>>> foreground='green')
>>>>                    elif value in ('Not Reg.'):
>>>>                        systemdata[i][k].config(text=value,
>>>> foreground='red')
>>>>                    else:
>>>>                        systemdata[i][k].config(text=value)
>>>>
>>>>
>>>> tk.Button(root, text="Update Table Data",
>>>> command=updatedata).grid(row=len(machines)+1, column=len(variables),
>>>> sticky=tk.S)
>>>>
>>>>
>>>>
>>>> Thanks,
>>>>
>>>> Iain
>>>>
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