How do I add text to a file without deleting what is already there?

Question

I'm making a login system for my school task and when I try to add text to a Notepad file using Python it deletes what is already there so I can only store the information of one user at a time. Any idea how I can fix this? I've looked around on the internet but I can't find the right combination of words to get the search result I want... thanks in advance. I'm using IDLE (Python 3.2 GUI)

Edit: Problem solved, thanks for the help everyone.

Vel · Accepted Answer · 2018-01-17T10:39:26.520

1

You have to open file in append mode, for example:

f_obj = open('myfile','a+')

edited Jan 17 '18 at 10:39

answered Jan 17 '18 at 10:33

Vel

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I suggest using context managers instead of assigning the object to a variable like that. – SitiSchu Jan 17 '18 at 10:35
Well ok, but it's just an example, similar to what docs.python provide – Vel Jan 17 '18 at 10:40
1

Thanks for the help, I've added the code and it works now. – ItsFyn Jan 17 '18 at 10:40

score 1 · Answer 2 · answered Jan 17 '18 at 10:34

1

For that, you have to use "a" mode for appending data in a file.

f_obj = open("c:/file_path",'a')
f_obj.write("append")

or

with open("c:/file_path", "a") as f_obj:
    f_obj.write("append")

answered Jan 17 '18 at 10:34

Harsha Biyani

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score 0 · Answer 3 · answered Jan 17 '18 at 10:38

0

You can use 'a for append' mode instead of 'r for right' mode, see following:

with open('your_exist_file.txt', 'a') as file:
    file.write('appended_text')

answered Jan 17 '18 at 10:38

Faddi

1

How do I add text to a file without deleting what is already there?

3 Answers3