How to Log Errors and Warnings into a File

How to make separate log file for error, warning in python?

While I agree with @Jordanm in the comments that I do not understand the reasoning behind wanting to do this, You can open multiple loggers that each go to different files.

import logging

errorlog = logging.getLogger("ErrorLog")
errorlog.setLevel(logging.ERROR)
handler = logging.FileHandler('ProgramErrorLog')
errorlog.addHandler(handler)

warninglog = logging.getLogger("WarningLog")
errorlog.setLevel(logging.WARNING)
handler = logging.FileHandler('ProgramWarningLog')
warninglog.addHandler(handler)

errorlog.error(f'this is an error')
warninglog.warning(f'this is a warning')

Send a message to whichever file by choosing which logger you use to send the message

You are using a StreamHandler object that you do not specify a destination for. In order to send your log to a file , you need to use a FileHandler object with your desired filename.

replace these two lines of code:

stream_handler = logging.StreamHandler()

log.addHandler(stream_handler)

with something more like these lines from my example:

handler = logging.FileHandler('ProgramErrorLog')
errorlog.addHandler(handler)

Python 3: How to log warnings and errors to log file?

try doing it like this

import logging
logging.basicConfig(filename='example.log',level=logging.DEBUG)
logging.debug('This message should go to the log file')
logging.info('So should this')
logging.warning('And this, too')

How to log errors for specific script to a file?

Take a look at PHP's built-in function error_log():

http://php.net/manual/en/function.error-log.php

It will give you a variety of options including the one you are after.

How to log Django warnings and errors to log file in Production?

You can follow the django logger here.

In your views.py:

import logging
logger = logging.getLogger(__name__)

then you can record using logger.error() or logger.warning() or logger.info().
It will create a logger file in your main project directory and it will list out all the logging details.

See this:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '{levelname} {asctime} {module} {process:d} {thread:d} {message}',
            'style': '{',
        },
        'simple': {
            'format': '{levelname} {message}',
            'style': '{',
        },
    },
    'handlers': {
        'logfile': {
            'level': 'DEBUG',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': "yourproject_name.log",
            'maxBytes': 100000,
            'backupCount': 2,
            'formatter': 'verbose',
        },
    },
    'loggers': {
        'django': {
            'handlers': ['logfile'],
            'level': 'INFO',
            'propagate': True,
        },
        'apps': {
            'handlers': ['logfile'],
            'level': 'DEBUG',
            'propagate': True,
        },
    },
}

How to write errors and warnings to a log file?

I'm sure of all of the pitfalls, I've read some people having trouble with sink not releasing file access to a log file, and you could potentially forget to reset sink to output back to console instead of the log file, which could potentially corrupt your log file. But you should be able to generate an error log by running your code to download the files through a try-catch block and writing out the error messages similar to below.

log.path <- # Path to log file

tryCatch({
  # Code to attempt
  log(q)

}, error = function(err.msg){
             # Add error message to the error log file
             write(toString(err.msg), log.path, append=TRUE)
          }
)

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