[Python] How to add multiple columns to pandas dataframe in one assignment

I'm trying to figure out how to add multiple columns to pandas simultaneously with Pandas. I would like to do this in one step rather than multiple repeated steps.

import pandas as pd

data = {'col_1': [0, 1, 2, 3],
'col_2': [4, 5, 6, 7]}
df = pd.DataFrame(data)


I thought this would work here...

df[['column_new_1', 'column_new_2', 'column_new_3']] = [np.nan, 'dogs', 3]

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