Python DataFrame not getting saved. How to permanently assign it?

Question

I assigned the dataframe to itself by reversing its index. But when I call it again, it's showing the old dataframe without reversing it.

apple = apple.reindex(index = apple.index[::-1])
apple.head()

Any help would be appreciated. Thanks in advance :)

Answer 1

For me it works nice.

np.random.seed(45)
apple = pd.DataFrame(np.random.randint(10, size=(3,4)), 
                     columns=list('abcd'), 
                     index=list('ABC'))

print (apple)
   a  b  c  d
A  3  0  5  3
B  4  9  8  1
C  5  9  6  8

apple = apple.reindex(index = apple.index[::-1])
print (apple)
   a  b  c  d
C  5  9  6  8
B  4  9  8  1
A  3  0  5  3

Another solution with DataFrame.iloc:

apple = apple.iloc[::-1]
print (apple)
   a  b  c  d
C  5  9  6  8
B  4  9  8  1
A  3  0  5  3