data = pd.DataFrame({
'key1': ['a', 'a', 'b', 'b', 'a', 'b', 'a', 'b'],
'key2': [0, 1, 0, 1, 0, 1, 0, 0],
'v1': [1, 2, 3, 4, 5, 6, 7, 8],
'v2': [-1, 0, 2.5, -0.5, 4.0, -1.2, 0.2, -1.7]
})
y, X = patsy.dmatrices('v2 ~ key1', data)
X
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