ndarray矩阵反转
a = np.arange(1, 10).reshape(3, 3)
b = a[::-1]
print(b)
会打印以下结果：
[[7 8 9]
[4 5 6]
[1 2 3]]
DataFrame数据反转
df = pd.DataFrame({'height':[178,162,181],'weight':[58,49,63],'gender':['male', 'female', 'male']},index=range(3))
print(df)
df1 = df.iloc[::-1]
print(df1)
df 和 df1分别如下:
