给定以下数据框：
df = pd.Dataframe([["Australia", 1, 3, 5], ["Bambua", 12, 33, 56], ["Tambua", 14, 34, 58] ], columns=["Country", "Val1", "Val2", "Val10"] )
它归结为一个简单的广播操作)：
>>> val1_minus_val10 = df["Val1"] - df["Val10"]>>> print(val1_minus_val10)0 -41 -442 -44dtype: int64
