How to log a Python exception?

To log an exception in Python we can use logging module and through that we can log the error.

Logging module provides a set of functions for simple logging and for following purposes

• DEBUG
• INFO
• WARNING
• ERROR
• CRITICAL

Logging an exception in python with an error can be done in the logging.exception() method. This function logs a message with level ERROR on this logger. The arguments are interpreted as for debug(). Exception info is added to the logging message. This method should only be called from an exception handler.

See the following code for more clarity:

Example 1 :

Python3

# importing the module
import logging

try:
    printf("GeeksforGeeks")
except Exception as Argument:
    logging.exception("Error occurred while printing GeeksforGeeks")

Output :

ERROR:root:Error occurred while printing GeeksforGeeks
Traceback (most recent call last):
  File "/home/gfg.py", line 3, in 
    printf("GeeksforGeeks")
NameError: name 'printf' is not defined

Example 2: We can also log the error message into a different file without showing error in the console by the following method:

Python3

# importing the module
import logging

try:
    printf("GeeksforGeeks")
except Exception as Argument:

     # creating/opening a file
     f = open("demofile2.txt", "a")

     # writing in the file
     f.write(str(Argument))

     # closing the file
     f.close()

Error message will be stored in file name demofille2.txt in same directory as code.

Output :

Traceback (most recent call last):
  File "/home/gfg.py", line 5, in 
    printf("GeeksforGeeks")
NameError: name 'printf' is not defined