[Python-Dev] ttk.Treeview.insert() does not allow to insert item with iid=0

[MRAB]

On 2018-03-16 20:22, Terry Reedy wrote:
> On 3/16/2018 6:54 AM, Игорь Яковченко wrote:
[snip]

>> There is no item with such iid. This item has autogenerated iid just 
>> like it's not specified.
>> I investigated problem and found that in ttk.py, Treeview.insert(... 
>> iid=None, ...) in method's body has a check:
>>          if iid:
>>              res = self.tk.call(self._w, "insert", parent, index,
>>                  "-id", iid, *opts)
>>          else:
>>              res = self.tk.call(self._w, "insert", parent, index, *opts)
>> It means that if iid is "True" then use it else autogenerate it.
>> Maybe there should be "if iid is not None", not "if iid"? Or there are 
>> some reasons to do check this way?
> 
> It might be that accepting '' as an iid would be a problem.
> Our current tkinter expert, Serhiy Storchaka, should know.  If so, "if
> iid in (None, '')" would be needed.
> 
The root of the tree has the iid ''.