Python: Saving a string to file without overwriting file's contents

Question

I need to add my program's outputs to a saved file every time I run the program without overwriting the previous outputs.

This is how I'm writing to a file now:

lead.write(str(alldates))

Any ideas?

Maybe you should spend some time looking at the documentation for the most basic methods you might be using, such as [`open`](http://docs.python.org/2.7/library/functions.html#open). — metatoaster, Mar 13 '14 at 07:16
possible dup - http://stackoverflow.com/questions/4706499/how-do-you-append-to-file-in-python — santosh-patil, Mar 13 '14 at 07:17

score 2 · Answer 1 · answered Mar 13 '14 at 07:25

Here, you should open the file in append mode:

append_text = str(alldates)
with open('my_file.txt', 'a') as lead:
    lead.write(append_text)

There are lots of specialised ways to open files for different purposes, and you can read about them in the documentation.

score 0 · Answer 2 · answered Mar 13 '14 at 07:16

0

You should open the file in append mode.

answered Mar 13 '14 at 07:16

satoru

2 Answers2