Pretty and more helpful exceptions in Python, automatically.
better_exceptions via pip:
$ pip install better_exceptions
And set the
BETTER_EXCEPTIONS environment variable to any value:
export BETTER_EXCEPTIONS=1 # Linux / OSX setx BETTER_EXCEPTIONS 1 # Windows
Python REPL (Interactive Shell)
In order to use
better_exceptions in the Python REPL, first install the package (as instructed above) and run:
$ python -m better_exceptions Type "help", "copyright", "credits" or "license" for more information. (BetterExceptionsConsole) >>>
in order to drop into a
better_exceptions-enabled Python interactive shell.
If you want to allow the entirety of values to be outputted instead of being truncated to a certain amount of characters:
import better_exceptions better_exceptions.MAX_LENGTH = None
better_exceptions in production, do not forget to unset the
BETTER_EXCEPTIONS variable to avoid leaking sensitive data in your logs.
If you do not see beautiful exceptions, first make sure that the environment variable does exist. You can try
echo $BETTER_EXCEPTIONS (Linux / OSX) or
echo %BETTER_EXCEPTIONS% (Windows). On Linux and OSX, the
export command does not add the variable permanently, you will probably need to edit the
~/.profile file to make it persistent. On Windows, you need to open a new terminal after the
Check that there is no conflict with another library, and that the
sys.excepthook function has been correctly replaced with the
better_exceptions's one. Sometimes other components can set up their own exception handlers, such as the
python3-apport Ubuntu package that you may need to uninstall.
Make sure that you have not inadvertently deleted the
better_exceptions_hook.pth file that should be in the same place as the
better_exceptions folder where all of your Python packages are installed. Otherwise, try re-installing
You can also try to manually activate the hook by adding
import better_exceptions; better_exceptions.hook() at the beginning of your script.
Finally, if you still can not get this module to work, open a new issue by describing your problem precisely and detailing your configuration (Python and
better_exceptions versions, OS, code snippet, interpeter, etc.) so that we can reproduce the bug you are experiencing.
Copyright © 2017, Josh Junon. Licensed under the MIT license.