Python简单搞定ndarray和DataFrame翻转

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: