mirror of https://github.com/Textualize/rich.git
76 lines
2.5 KiB
ReStructuredText
76 lines
2.5 KiB
ReStructuredText
Traceback
|
|
=========
|
|
|
|
Rich can render Python tracebacks with syntax highlighting and formatting. Rich tracebacks are easier to read and show more code than standard Python tracebacks.
|
|
|
|
To see an example of a Rich traceback, running the following command::
|
|
|
|
python -m rich.traceback
|
|
|
|
|
|
Printing tracebacks
|
|
-------------------
|
|
|
|
The :meth:`~rich.console.Console.print_exception` method will print a traceback for the current exception being handled. Here's an example::
|
|
|
|
from rich.console import Console
|
|
console = Console()
|
|
|
|
try:
|
|
do_something()
|
|
except Exception:
|
|
console.print_exception(show_locals=True)
|
|
|
|
The ``show_locals=True`` parameter causes Rich to display the value of local variables for each frame of the traceback.
|
|
|
|
See `exception.py <https://github.com/willmcgugan/rich/blob/master/examples/exception.py>`_ for a larger example.
|
|
|
|
|
|
Traceback handler
|
|
-----------------
|
|
|
|
Rich can be installed as the default traceback handler so that all uncaught exceptions will be rendered with highlighting. Here's how::
|
|
|
|
from rich.traceback import install
|
|
install(show_locals=True)
|
|
|
|
There are a few options to configure the traceback handler, see :func:`~rich.traceback.install` for details.
|
|
|
|
|
|
Suppressing Frames
|
|
------------------
|
|
|
|
If you are working with a framework (click, django etc), you may only be interested in seeing the code from your own application within the traceback. You can exclude framework code by setting the `suppress` argument on `Traceback`, `install`, and `Console.print_exception`, which should be a list of modules or str paths.
|
|
|
|
Here's how you would exclude `click <https://click.palletsprojects.com/en/8.0.x/>`_ from Rich exceptions::
|
|
|
|
import click
|
|
from rich.traceback import install
|
|
install(suppress=[click])
|
|
|
|
Suppressed frames will show the line and file only, without any code.
|
|
|
|
Max Frames
|
|
----------
|
|
|
|
A recursion error can generate very large tracebacks that take a while to render and contain a lot of repetitive frames. Rich guards against this with a `max_frames` argument, which defaults to 100. If a traceback contains more than 100 frames then only the first 50, and last 50 will be shown. You can disable this feature by setting `max_frames` to 0.
|
|
|
|
Here's an example of printing an recursive error::
|
|
|
|
from rich.console import Console
|
|
|
|
|
|
def foo(n):
|
|
return bar(n)
|
|
|
|
|
|
def bar(n):
|
|
return foo(n)
|
|
|
|
|
|
console = Console()
|
|
|
|
try:
|
|
foo(1)
|
|
except Exception:
|
|
console.print_exception(max_frames=20) |