TK-grid problem, please help

[Anton Vredegoor]

Ray wrote:

> hi, I have a question about how to use .grid_forget (in python/TK)
> 
> I need to work on grid repeatly. everytime when a button is pressed,
> the rows of grid is different. such like, first time, it generate 10 
> rows of data.
> 2nd time, it maybe only 5 rows. so I need a way to RESET the grid data
> every time. how can I do it? by grid_forger()?, then would anyone can 
> help on
> how to use grid_forget()
> the sample code as following:

I'm not sure if it solves your problem but this modification of your 
code at least *looks* like it works better. The entries are completely 
destroyed so that the next time you call the function they can be 
recreated.

The trick I am using is to use a list in the arguments of the function 
but that is a bit of a hack, the list 'remembers' its state from the 
last time the function was called, I think one should use classes for 
bookkeeping such things instead.

from Tkinter import *

def mygrid(text,M = []):
      ######## how to use grid_forget() to clean the grid??###########
      while M:
          x = M.pop()
          x.destroy()
      rows = []
      count=int(text)
      for i in range(count):
          cols = []
          for j in range(4):
              e = Entry(frame3, relief=RIDGE)
              M.append(e)
              e.grid(row=i, column=j, sticky=NSEW)
              e.insert(END, '%d.%d' % (i, j))
              cols.append(e)
              rows.append(cols)


root=Tk()

frame1=Frame(root, width=150, height=100)
frame1.pack()

text=Entry(frame1)
text.pack(side=LEFT)

button=Button(frame1, text='generate grid', command=(lambda:
mygrid(text.get())))

button.pack()

frame2=Frame(root, width=150, height=100)
frame2.pack()

button2=Button(frame2, text='exit', command=root.quit)
button2.pack()

frame3=Frame(root, width=150, height=300)
frame3.pack()

root.mainloop()

A.