How to add new items to a HBox after being created

What would be the best way to add new items to an HBox once again being instantiated and displayed.

import ipywidgets as widgets
from IPython.display import display

HeaderLabels = ['Column-1', 'Column-2', 'Column-3']    
HeaderWidgets= [widgets.Label(Text) for Text in HeaderLabels]
HorizBox = widgets.HBox(HeaderWidgets)

display(HorizBox)

After some selection in another widget it is needed to add a new label to the HBox. The only way I have found to do this is (in the change value event called function) to close it and recreate a new one to be displayed. This is,

NewHeaderWidgets=list(HorizBox.children)
HorizBox.close()
NewLabelWidget=widgets.Label('New Column')
NewHeaderWidgets.append(NewLabelWidget)
NewHorizBox = widgets.HBox(NewHeaderWidgets)
display(NewHorizBox, , display_id="1")

This works, but there is another straightforward method to do that? I hope to find a method like

HorizBox.children.append(NewLabelWidget) # but it is an inmutable tuple an raise an error

also i have tried to update the display, but the output header is duplicated (the old one is not erased)

HorizBox.children=tuple(list(HorizBox.children).append(widgets.Label('New Column')))
update_display(NewHorizBox , display_id="1")

It is possible to redisplay the HBox representation with the update in the same cell?

[jasongrout]

If you preferred, in python 3 you can also use a splatting syntax to create the new tuple: HorizBox.children = (*HorizBox.children, NewLabelWidget)

[jasongrout]

Great! I’m closing this issue as answered, but feel free to open other issues for other questions, or ask on our gitter channel, etc.