pandas使用apply多列生成一列数据的实例

import pandas as pd
def my_min(a, b):
  return min(abs(a),abs(b))

s = pd.Series([10.0247,10.0470, 10.0647,10.0761,15.0800,10.0761,10.0647,10.0470,10.0247,10.0,9.9753,9.9530,9.9353,9.9239,18.92,9.9239,9.9353,9.9530,9.9753,10.0])
df = pd.Data (s)
df.columns=[\'value\']
df[\'val_1\'] = df[\'value\'].diff()
df[\'val_2\'] = df[\'val_1\'].shift(-1)
df[\'val\'] = df.apply(lambda row: my_min(row[\'val_1\'], row[\'val_2\']), axis=1)