Pyhton call up all lines in text-file

Question

I created a text-file. My first line is:
> 1 Start Writing something:
After adding a line with:
file = open("first-file.txt", "w")
file.write("I am the second line.")
file.close()
file = open("first-file.txt", "r")
print(file.read())
> I am the second line.
! PROBLEM FOR ME: Python only prints out the line I added, but not my first Line with the text "Start Writing something"
? MY QUESTION:
????? Why is it like that?
????? How can I make python printing the whole text-file?
Thank You for Your Help. It's much appreciated.
Greetings from Susi

Answer 1

writing to a file that already have a content you will need to append to it and not just write, because 'w' erase everything and put in your new sentence https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2447/

Answer 2

It is the whole text-file - unfortunately.
'w' indicates that the file will be *overwritten*.
If you don't want that, you need to use another file mode. 'a' comes to mind.
https://www.geeksforgeeks.org/file-handling-JUMP_LINK__&&__python__&&__JUMP_LINK/