pandas 条件赋值

 df["WhereCol"] = np.where((df.Cat == "A") & (df.B > 10), 1, 0)

conditions = [
  (df.Cat == "A") & (df.B > 10),
  (df.Cat == "B") & (df.B > 10)
]values = [1, 2]df["SelectCol"] = np.select(conditions, values, default=0)

xg.case_when(xg.A3.str.slice(16,17).astype(int) % 2 ==0,'女',
             ~xg.A3.str.slice(16,17).astype(int) % 2 ==0,'男',
             '不详',
             column_name="性别")

xg=xg.case_when(xg.A3.str.contains('^62'),'甘肃',
             ~xg.A3.str.contains('^62'),'外省',
             '其他',
             column_name="归属")