New layout columns

ash2shukla · October 15, 2020, 10:15am

Hi @Thiemo_Seys, Welcome to the community !

I don’t think you can have nested columns or even expanders. Check this bit of code.

streamlit/streamlit/blob/e67525b91f42f64fdc69c9e00c474c80cf5c7cd7/lib/streamlit/delta_generator.py#L525


# Internal block element, to hide the 'layout' param from our users.
def _block(self, block_proto=Block_pb2.Block()):
    # Switch to the active DeltaGenerator, in case we're in a `with` block.
    self = self._active_dg

    # Prevent nested columns & expanders by checking all parents.
    block_type = block_proto.WhichOneof("type")
    # Convert the generator to a list, so we can use it multiple times.
    parent_block_types = [t for t in self._parent_block_types]
    if block_type == "column" and block_type in parent_block_types:
        raise StreamlitAPIException(
            "Columns may not be nested inside other columns."
        )
    if block_type == "expandable" and block_type in parent_block_types:
        raise StreamlitAPIException(
            "Expanders may not be nested inside other expanders."
        )

    if self._container is None or self._cursor is None:
        return self

Can you describe your use case? Maybe we can explore an alternative way to achieve it?

I think we will have this functionality of nesting columns/expanders in future releases? @randyzwitch can you please comment on it?

Hope it helps!

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