numpy
2025年9月5日小于 1 分钟
sorting,searching and counting
numpy.where
case when
df['flag'] = np.where((df['xn'] == '(3+2)') & (df['nj'] == '4'), 1, 0)
result = np.where(arr<=3, 0, np.where(arr<=6, 1, 2))
df['flag'] = np.where((df['xn'] == '(3+2)') & (df['nj'] == '4'), 1, 0)
result = np.where(arr<=3, 0, np.where(arr<=6, 1, 2))