errortools 3.4.0

errortools - a toolset for working with Python exceptions and warnings and logging.

errortools

A lightweight Python exception handling utility library.

Installation

Use pip...

pip install errortools

...or uv

uv add errortools

Features

• Suppress: ignore(), super_fast_ignore(), @suppress() — silence exceptions gracefully
• Retry & Timeout: @retry(), @timeout() — auto retry with delay, async timeout
• Raise & Convert: raises(), reraise(), @convert() — batch raise, type conversion
• Catch & Collect: super_fast_catch(), ExceptionCollector — inspect or batch exceptions
• Caching: @error_cache — LRU exception cache, like functools.lru_cache
• Custom Exceptions: PureBaseException, ContextException, BaseErrorCodes
• Logging: structured logger with sinks, context binding, and exception capture

Quick Start

from errortools import ignore, retry, reraise, error_cache, suppress, convert
from errortools.future import super_fast_ignore, super_fast_catch, ExceptionCollector

# ── Suppress ─────────────────────────────────────────────────
with ignore(KeyError) as err:               # full metadata
    _ = {}["missing"]
# err.be_ignore=True, err.name='KeyError', err.traceback=...

with super_fast_ignore(ValueError):         # zero-overhead
    int("bad")

@suppress(ZeroDivisionError, default=0)     # decorator form
def divide(a, b): return a / b

# ── Retry ────────────────────────────────────────────────────
@retry(times=3, on=ConnectionError, delay=1.0)
def connect(host: str): ...

# ── Convert ──────────────────────────────────────────────────
@convert(KeyError, ValueError)              # decorator
def lookup(d, key): return d[key]

with reraise(KeyError, ValueError):         # context manager
    raise KeyError("x")                     # → ValueError

# ── Catch & Collect ──────────────────────────────────────────
with super_fast_catch(ValueError) as ctx:
    raise ValueError("oops")
# ctx.exception → ValueError('oops')

collector = ExceptionCollector()
collector.catch(int, "bad1")
collector.catch(int, "bad2")
collector.raise_all()                       # → ExceptionGroup

# ── Cache ────────────────────────────────────────────────────
@error_cache(maxsize=64)
def load(uid: int):
    if uid < 0: raise ValueError(f"invalid: {uid}")
    return {"id": uid}

Custom Exceptions

from errortools import PureBaseException, ContextException, BaseErrorCodes

class AppError(PureBaseException):
    code = 9000
    default_detail = "Application error."

err = ContextException("failed").with_context(service="db")
raise BaseErrorCodes.not_found("user #42")  # NotFoundError [3001]

Logging

from errortools.logging import logger

logger.info("Server started on port {}", 8080)
logger.add("app.log", rotation=10_485_760, retention=5)
with logger.catch():
    int("not a number")                     # logged + suppressed

Documentation

Full docs: docs | License: LICENSE