colorful-logger 0.2.0a1

A colorful logger for python3.

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Python Colorful Logger

Colorful logger for python3.

How to use

Install

pip install colorful-logger

Usage

1 default logger

You can directly use the default logger, the colored logs will be printed on the terminal, and the default logger level is warning.

from colorful_logger import logger

with logger:
    logger.debug("default logger")
    logger.info("default logger")
    logger.warning("default logger")
    logger.error("default logger")

As you can see, logger needs to be executed in the with statement, because this package uses QueueListener to call log output. You need to call the start method before using logger to output the log, and you need to call the stop after the end of use. I encapsulated these two methods in the with statement. In non-special scenarios, there is no need to call the start and stop methods separately.

2 custom logger

You can also change the log level, save the log to a file, change the logger name, and the log may not be output to the terminal.

from colorful_logger import get_logger, DEBUG


def demo_logger(to_file=False):
    file = "test_%d.log"

    l1 = get_logger(
        "demo",
        DEBUG,
        add_file_path=False,
        disable_line_number_filter=False,
        file_path=file % 1 if to_file else None,
    )
    with l1:
        l1.debug("without file path")
        l1.info("without file path")
        l1.warning("without file path")
        l1.error("without file path")

    l2 = get_logger(
        "demo",
        DEBUG,
        add_file_path=True,
        disable_line_number_filter=False,
        file_path=file % 2 if to_file else None,
    )
    with l2:
        l2.debug("with file path")
        l2.info("with file path")
        l2.warning("with file path")
        l2.error("with file path")

    l3 = get_logger(
        None,
        DEBUG,
        add_file_path=True,
        disable_line_number_filter=True,
        file_path=file % 3 if to_file else None,
    )
    with l3:
        l3.debug("without name, and with path")
        l3.info("without name, and with path")
        l3.warning("without name, and with path")
        l3.error("without name, and with path")

    l4 = get_logger(
        None,
        DEBUG,
        add_file_path=False,
        disable_line_number_filter=True,
        file_path=file % 4 if to_file else None,
    )
    with l4:
        l4.debug("without name and path")
        l4.info("without name and path")
        l4.warning("without name and path")
        l4.error("without name and path")

There may be unexpected situations when outputting logs outside of the with statement, which may not achieve the expected results.

The content of the log file ./test.log (example, inconsistent with the information in the above figure):

10:09:33.146 DEB demo:26 - without file path
10:09:33.146 INF demo - without file path
10:09:33.146 WAR demo - without file path
10:09:33.146 ERR demo:29 - without file path

The log output to the file is not a color log by default.

If you need to save the color log in a file, set the file_colorful parameter to True. In this example, the color log is saved.

The color log file has only one function, which is to view the real-time log in the terminal:

• Unix

tail -f test.log
# 或
cat test.log

• Windows

Get-Content -Path test.log

3 child logger

After defining a logger, I want to use all the parameters of this logger except name to output the log. At this time, you need to use the child_logger method to generate a child logger. The child logger needs to be in the with of the parent logger Execute in the statement:

from colorful_logger import get_logger, DEBUG

# parent logger
logger = get_logger(name="sample_logger", level=DEBUG, file_path="./test.log")

with logger:
    logger.error("parent error")
    l1 = logger.child("l1")
    l1.error("l1 error")
    l1.fatal("l1 fatal")

The child logger is the same except that the name is different from the parent logger, and it will not output the log of the third-party library.

The execution of the child logger in the with statement of the parent logger does not mean that it must be called directly in the with statement. It can be executed in a function in the with statement, such as:

# log.py
from colorful_logger import get_logger, DEBUG

logger = get_logger(name="sample_logger", level=DEBUG, file_path="./test.log")

# main.py
from log import logger
from other_file import test

with logger:
    test()

# other_file.py

test_logger = logger.child("test_logger")

def test():
    test_logger.error("test error")