corpsecamper / tbvaccine

A small utility to pretty-print Python tracebacks.

TBVaccine

TBVaccine is a utility that pretty-prints Python tracebacks. It automatically highlights lines you care about and deemphasizes lines you don't, and colorizes the various elements in a traceback to make it easier to parse.

Here are some screenshots. This is the before:

And this is the after:

Installation

To install, use pip:

pip install tbvaccine

You are done!

Usage as a command-line utility

TBVaccine can be used from the command line. Just pipe STDERR into it from the program you want to watch:

./myscript.py 2>&1 | tbvaccine

And all the tracebacks will now be pretty!

Usage as a Python library

There are various ways to use TBVaccine as a Python library.

Initialize it like so:

from tbvaccine import TBVaccine
tbv = TBVaccine(
    code_dir="/my/code/dir",
    isolate=True
)

code_dir marks the directory we code about. Files under that directory that appear in the traceback will be highlighted. If not passed, the current directory, as returned by os.getcwd() will be used.

If isolate is False, all lines are colorized, and code_dir is ignored.

To use it in an except block:

from tbvaccine import TBVaccine
try:
    some_stuff()
except:
    print(TBVaccine().format_exc())

To make it the default way of printing tracebacks, use add_hook():

import tbvaccine
tbvaccine.add_hook()

1 / 0

Bam! Instant pretty tracebacks.

Epilogue

This library is still pretty new, please contribute patches if something doesn't work as intended, and also please tell your friends about it! Hopefully one day it will be implemented in the Python interpreters themselves.

-- Stavros