set multiple Pandas DataFrame columns to values in a single column or multiple scalar values at the same time

Question

I\'m trying to set multiple new columns to one column and, separately, multiple new columns to multiple scalar values. Can\'t do either. Any way to do it other than setting

Answer 1

for c in ['C', 'D']:
    df[c] = d['A']

df['C'] = 0
df['D'] = 1