'Percentages over column total avoiding warning

I am trying to get a new column with percentages over the total of another column without the warning regarding the copy/slice problem,

So "data" table is in place, so I want to add a new column "%" which is the percentage of m€ over total m€...

data_assets["%"] = data_assets["m€"]/data_assets["m€"].sum()

It looks like it's working but would like the workaround for the warning.

pandas

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