NexusLog

License Python Version

High-performance async logging library, compatible with Python standard logging API.

Benchmark

Benchmark chart

Benchmarking with 1,000,000 log messages

------------------------------------------------------------
Logger               Time (s)     Msgs/sec        Log size    
------------------------------------------------------------
loguru               7.675        130,297         89,888,890 bytes
Python logging       5.313        188,206         82,888,890 bytes
picologging          2.038        490,626         79,888,888 bytes
spdlog               0.199        5,034,527       79,888,890 bytes
NexusLogger          0.049        20,304,036      97,888,890 bytes
NexusLogger unix_ts  0.049        20,451,884      83,868,922 bytes
------------------------------------------------------------

NexusLogger is 4.03x faster than spdlog
NexusLogger is 41.38x faster than picologging
NexusLogger is 107.88x faster than Python logging
NexusLogger is 155.83x faster than loguru
NexusLogger unix_ts is 4.06x faster than spdlog
NexusLogger unix_ts is 41.69x faster than picologging
NexusLogger unix_ts is 108.67x faster than Python logging
NexusLogger unix_ts is 156.96x faster than loguru

Installation

pip install nexuslog

Quick Start

import nexuslog as logging

logging.basicConfig(level=logging.INFO)

logging.info("Hello, world!")
logging.warning("This is a warning")
logging.error("This is an error")

API

Log Levels

logging.TRACE
logging.DEBUG
logging.INFO
logging.WARNING
logging.ERROR

Module-level Functions

logging.basicConfig(filename=None, level=logging.INFO, unix_ts=False)
logging.basicConfig(
    level=logging.INFO,
    name_levels={"db": logging.DEBUG, "http.client": logging.WARNING},
)
logging.trace(message, *args)
logging.debug(message, *args)
logging.info(message, *args)
logging.warning(message, *args)
logging.error(message, *args)

Lazy %-style Formatting

Like the standard logging module, extra arguments are merged into the message with %-style formatting — but only if the log level is enabled. When the level is disabled, the arguments are never formatted (no str()/repr() calls), making disabled log calls nearly free:

logger.info("price=%s qty=%s side=%s", price, qty, side)
logger.debug("state=%r retries=%d", state, retries)  # zero cost at INFO level

Supported conversions: %s %r %d %i %f %e %g %x %o %%, plus the full % operator spec (width, precision, flags, %(name)s with a dict argument) with semantics identical to Python's message % args. Simple placeholders are rendered natively in Rust — formatting with args is faster than building the message with an f-string at the call site. A message logged without args is emitted verbatim, so literal % needs no escaping.

Logger Class

from nexuslog import Logger, Level

logger = Logger("myapp", path="/var/log/app", level=Level.Info)
logger.info("message")
logger.shutdown()

getLogger

import nexuslog as logging

logging.basicConfig(filename="/var/log/app.log", level=logging.DEBUG)
logger = logging.getLogger("myapp")
logger.info("message")

License

MIT

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nexuslog-lib 0.7.0

NexusLog

Benchmark

Installation

Quick Start

API

Log Levels

Module-level Functions

Lazy %-style Formatting

Logger Class

getLogger

License

Project links

Key dates

1 maintainer

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