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+--- Thread: How to overwrite file (/thread-25810.html)
How to overwrite file - SriRajesh - Apr-12-2020
Hi,
I am writing some log file, and when I run each time I want to flush out everything (don't want to keep any previous data) I use the below code, but it is not working, I also tried with "w+", "a", and "a+" mode, still does not work. Kindly help how to fix it.
import logging
# log messages to a file, ignoring anything less severe than ERROR
logging.basicConfig(filename='myprogram.log', filemode = 'w', level=logging.ERROR)
# these messages should appear in our file
logging.error("The washing machine is leaking!")
logging.critical("The house is on fire!")
# but these ones won't
logging.warning("We're almost out of milk.")
logging.info("It's sunny today.")
logging.debug("I had eggs for breakfast.")
RE: How to overwrite file - deanhystad - Apr-13-2020
What are you using (os, python version, dev tools). When I run this on my Windows desktop with Python 3.8.2 I cannot get it to append, regardless of the filemode.
RE: How to overwrite file - SriRajesh - Apr-14-2020
Windows7, python version: 3.6.8 |Anaconda 4.3.1 (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
DO I need to import anything or do anything?
RE: How to overwrite file - steve_shambles - Apr-14-2020
I had the same problem with my Sync-It app this week.
I used "W+" for all the writes and to clear the log, and setting up the log.
I used this to clear the log:
with open('syncit.log', 'w+'):
passI did this on start up and after the log details had been displayedand I didn't need the data any more.
Then I had the problem that clearing it this way (on my Windows computer at least)
it left a lot of "NUL" characters that confused my code when I tried
to read the lines into strings.
To remove these I found a re solution on stackoverflow:
line = re.sub(r'[\x00-\x1F]+', '', line) # Strip some non ASCII.and all my problems were solved.
See my GitHub repositories for Sync-It code if you want.
https://github.com/steveshambles?tab=repositories
I'm working on an update at the moment V0.37 with much improved code and a few new features
should be uploading it to GitHub tomorrow sometime.