How to capture an error message

[snippsat]

so that I can save it to a log or something. Is there a way to do that?

Can do it with logging module,look at this post.
In that post i use logging in standard library,you see i have to write boiler plate code and i import it with import my_log.

There is a easier way if using eg Loguru.
No boiler plate code,if i use same function as in post.

from loguru import logger

logger.add("output.log", backtrace=True, diagnose=True)

def add(x, y):
   try:
       return(x + y)
   except Exception as error:
       logger.exception('msg')

if __name__ == '__main__':
    add(5, '50')

Output:
λ cat output.log
2020-02-15 15:42:45.104 | ERROR    | __main__:add:8 - msg
Traceback (most recent call last):

  File "add_guru.py", line 11, in <module>
    add(5, '50')
    -> <function add at 0x033308A0>

> File "add_guru.py", line 6, in add
    return(x + y)
           |   -> '50'
           -> 5

TypeError: unsupported operand type(s) for +: 'int' and 'str'

Loguru can also catch error even if not using try:except,bye using a decorator.

from loguru import logger

logger.add("file_1.log", rotation="5 MB")

@logger.catch
def add(x, y):
    return(x + y)

if __name__ == '__main__':
    add(5, '99')

Output:
λ cat file_1.log
2020-02-15 15:59:35.736 | ERROR    | __main__:<module>:12 - An error has been caught in function '<module>', process 'MainProcess' (13600), thread 'MainThread' (10060):
Traceback (most recent call last):

> File "catch_guru.py", line 12, in <module>
    add(5, '99')
    -> <function add at 0x0320AF60>

  File "catch_guru.py", line 9, in add
    return(x + y)
           |   -> '99'
           -> 5

TypeError: unsupported operand type(s) for +: 'int' and 'str'