Configparser does not ignore comments

[sunnyhasija]

I have a configuration file of the following type: config.ini

[main]
subreddits = ["PCMasterrace", "emacs"] # list of all the subreddits

[time]
# make sure that the time is in unixtime
#the starting time and ending time are only needed if you want to pass it to the main script. If using crontab, you dont need to.
start = 1584577650 #explicity stating starting time
end = 1584664050 #explicitly stating ending time.
#

in my python file, when I use config parser I get errors:

config.read("config.ini")

SUBREDDITS = json.loads(config.get("main", "subreddits"))
START_TIME = int(config.get("time", "start"))
ACTUAL_END_TIME = int(config.get("time", "end"))

Error is File "/usr/lib64/python3.9/json/decoder.py", line 340, in decode raise JSONDecodeError("Extra data", s, end).

Upon investigation config parser is getting ["PCMasterrace", "emacs"] # list of all the subreddits including the comment, and then json.loads is tripping over it.

This issue is thus far in python 3.9, and not in 3.8.

[tirkarthi]

The behavior exists with stdlib too. This project is a backport. Upon search it seems this was reported and closed as won't fix : https://bugs.python.org/issue592527

[jaraco]

Yes, but that issue was from 2002. The user is reporting the issue is a regression with Python 3.9.

[jaraco]

The user's report appears to be invalid. I created a reproducer and the behavior is the same on Python 3.8 and 3.6.

~ $ python3.9 -c "import configparser; cp = configparser.ConfigParser(); cp.read_string('[section]\\nvalue=1234#foo\\n'); print(cp['section']['value'])"
1234#foo
~ $ python3.8 -c "import configparser; cp = configparser.ConfigParser(); cp.read_string('[section]\\nvalue=1234#foo\\n'); print(cp['section']['value'])"
1234#foo
~ $ python3.6 -c "import configparser; cp = configparser.ConfigParser(); cp.read_string('[section]\\nvalue=1234#foo\\n'); print(cp['section']['value'])"
1234#foo