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How to log an error in Python ?



In this post , we will see - How to log an error in Python with debug information. Logging is important is Python to debug the errors .

Lets see how we can do that. (Also in the same context , MUST READ earlier posts - How to Handle Errors and Exceptions in Python ? How to Code Custom Exception Handling in Python ?)  

Option 1 - Using logging.error -


import logging

try:
  <SOME\_OPERATION>

except <STANDARD\_PYTHON\_ERRORNAME>:  #Any Stanndard Error
  logging.exception("message")

 

**Option 2 - Using sys.excepthook - **

To handle all types of uncaught exceptions, wecan use the "try-except" block (read our detailed post here) or we can use sys.excepthook. Note that - excepthook is invoked every time an exception is raised but is uncaught.  So you can override the default behavior of sys.excepthook to do as you would like it (including using logging.exception). When an exception is raised and uncaught, the interpreter calls sys.excepthook with 3 parameters -

  • Exception class,
  • Exception instance,
  • A traceback object
But we can customize the handling by assigning another three-argument function to sys.excepthook. Let's see an example as to how to use it -


import logging
import sys

logger = logging.getLogger('<CUSTOME\_LOGGER>')
# Write a Custom logger to write to a text file

def customr\_handle(exc\_type, exc\_value, exc\_traceback):
  logger.exception("Uncaught exception: {0}".format(str(exc\_value)))

# Initiate exception handler
sys.excepthook = customr\_handle


if \_\_name\_\_ == '\_\_main\_\_':
  main()

Another way of using it


import sys
import logging

logger = logging.getLogger(\_\_name\_\_)
handleIt = logging.StreamHandler(stream=sys.stdout)
logger.addHandler(handleIt)

def custom\_handler(type, value, traceback):
  if issubclass(exc\_type, <ANY\_STANDARD\_EXCEPTION>):
    sys.\_\_excepthook\_\_(type, value, traceback)
    return

  logger.error("Uncaught exception", exc\_info=(type, value, traceback))

sys.excepthook = custom\_handler

if \_\_name\_\_ == "\_\_main\_\_":
  raise RuntimeError("Test The Logic")

 

Option 3 - Using the logging to a file -

You can log to an external file.


logFile = open("logoutput.log", "w")

try: 
  <SOME\_OPERATION>

except Exception as e:
  logFile.write("Exception - {0}\\n".format(str(e)))



 

Option 4 - Using exc_info -

This function gives back a tuple of three values - which are the information about the exception being handled. The information returned is specific both to the current thread and to the current stack frame.


import sys

print sys.exc\_info()

try: 
  <SOME\_OPERATION>

except <ANY\_STANDARD\_EXCEPTION>: 
  print sys.exc\_info()



  Or you can also use as below -


try: 
  <SOME\_OPERATION>

except Exception as e:
  logging.critical(e, exc\_info=True)

 

Option 5 - Using the traceback module -


import traceback

try:
 raise Exception()

except Exception as e:
 print(traceback.extract\_tb(e.\_\_traceback\_\_))


 

Other Interesting Reads -

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