Python

idx = 0
new_col = [7, 8, 9]  # can be a list, a Series, an array or a scalar   
df.insert(loc=idx, column='Col_name', value=new_col)

pandas.DataFrame.insert('chosen index','column name','values')

df.insert(loc, column_name, value)

df_new.insert(0, 'Group', group)df_new

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