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Directory selection from Tkinter part of Python 3.0, i.e. "askdirectory"
function from tkinter.filedialog does not work. It works for 2.x Python,
other Tkinter functions (askopenfilename, asksaveasfilename) work well
at both 2.x and 3.0 versions.

Please be more explicit: what does "not work" mean? What do you do, what
happens, what do you expect to happen instead?

When I do in Python 2.x (e.g. 2.6) next:
----------------------------
import Tkinter as T
import tkFileDialog as F
t = T.Tk()
dn = F.askdirectory()
----------------------------
It pop-ups the dialog, it is OK. Analogical case for Python 3.0 does not
work, at least on my Linux box:
----------------------------
import tkinter as T
import tkinter.filedialog as F
t = T.Tk()
dn = F.askdirectory()
----------------------------
It just writes an error message below:
----------------------------
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/local/lib/python3.0/tkinter/filedialog.py", line 430, in
askdirectory
 return Directory(**options).show()
 File "/usr/local/lib/python3.0/tkinter/dialog.py", line 20, in __init__
 cnf['title'], cnf['text'],
KeyError: 'title'
----------------------------
When I had tried to put there all the parameters it was asking for, it
just put some nonsense window.

Ah. That's a duplicate of issue 4406.