Error in checkboxtreeview.py line # 175 about ttkwidgets HOT 2 CLOSED

Thank you for opening this issue!

As far as I understand it, the code is not at fault, exactly, but there may be some unclarity. The only way I could find to reproduce your issue is to insert an item in the following manner, modified from example_checkboxtreeview.py:

tree = CheckboxTreeview(root)
tree.pack()

tree.insert("", "end", "1", text="1", tags=("hello","world"))
tree.insert("1", "end", "11", text="11", tags=("hello"))

This produces the error on Python 3.8:

Traceback (most recent call last):
  File "/home/user/Source/ttkwidgets/examples/example_checkboxtreeview.py", line 15, in <module>
    tree.insert("1", "end", "11", text="11", tags="hello")
  File "/home/user/Source/ttkwidgets/ttkwidgets/checkboxtreeview.py", line 172, in insert
    kw["tags"] += (tag,)
TypeError: can only concatenate str (not "tuple") to str

However, I think that the way Python handles the declaration of tuples is the cause of the confusion here. ("hello") is not a tuple, it is a string:

>>> ("hello")
'hello'

whereas ("hello",) is a tuple:

>>> ("hello",)
('hello',)

This is so that string declarations can be made to easily span multiple lines in Python by wrapping them in parentheses.

Therefore, the argument to tags should always be wrapped in parentheses and, if it contains only a single element, the element must be followed by a comma.

If this is not what you are seeing, please let me know, because then it could be a proper bug that needs to be fixed. Of course, without seeing the whole code, I cannot determine with certainty that this is the cause of the confusion, but it is my best guess. I hope this helps you!

from ttkwidgets.

Indeed I was sloppy and was not declaring a tuple by appending , after a single string tuple. Sorry for newbie question. Thank you for the great answer!

from ttkwidgets.