If I load a text file from Python and read it once, can't I read it with another read line?

Hi, how are you?

Text file

For example, it is called as followsHmmm

data = open('text.txt')  
aa=data.read()
bb=data.readline()

If you use these two,

In the first aa, print(aa), the contents of the text file appear

The second bb seems to be read without error, but if you print (bb), It looks like there's nothing.

[] 

If I load a text file from Python and read it once, can't I read it with another read line?

If I want to use two according to the situation, should I reopen the text file every time?