Python logging模塊

Logging日志一共五個(gè)級(jí)別

• debug : 打印全部的日志,詳細(xì)的信息,通常只出現(xiàn)在診斷問(wèn)題上
• info : 打印info,warning,error,critical級(jí)別的日志,確認(rèn)一切按預(yù)期運(yùn)行
• warning : 打印warning,error,critical級(jí)別的日志,一個(gè)跡象表明,一些意想不到的事情發(fā)生了,或表明一些問(wèn)題在
• 不久的將來(lái)(例如。磁盤空間低”),這個(gè)軟件還能按預(yù)期工作
• error : 打印error,critical級(jí)別的日志,更嚴(yán)重的問(wèn)題,軟件沒(méi)能執(zhí)行一些功能
• critical : 打印critical級(jí)別,一個(gè)嚴(yán)重的錯(cuò)誤,這表明程序本身可能無(wú)法繼續(xù)運(yùn)行

日志級(jí)別：CRITICAL >ERROR> WARNING > INFO> DEBUG> NOTSET

logging日志設(shè)置以及使用

import logging

# 日志記錄最低輸出級(jí)別設(shè)置
logger = logging.getLogger()    
logger.setLevel(logging.DEBUG) 

# Logging記錄到文件
fh = logging.FileHandler("test.log", mode='w')
logger.addHandler(fh)  # 將logger添加到handler里面

#### Logging記錄格式以及設(shè)置
formatter = logging.Formatter("%(asctime)s - %(message)s") # 記錄時(shí)間和消息
fh.setFormatter(formatter) # 此處設(shè)置handler的輸出格式

# Logging使用
logger.info("this is info")
logger.debug("this is debug")
logger.warning("this is warning")
logging.error("this is error")
logger.critical("this is critical")

輸出test.log

2019-03-18 21:39:37,260 - this is info
2019-03-18 21:39:37,260 - this is debug
2019-03-18 21:39:37,260 - this is warning
2019-03-18 21:39:37,260 - this is error
2019-03-18 21:39:37,260 - this is critical

yaml配置logger

• 文件目錄

-----app
│    │    
│    factoty.py
-----config
|    |
|    config.yaml
|    logging.yaml
run.py

• 編寫logging.yaml

version: 1
disable_existing_loggers: False
# 定義日志輸出格式，可以有多種格式輸出
formatters:
    simple:
        format: "%(message)s"
    error:
        format: "%(asctime)s [%(name)s] [%(levelname)s] :%(levelno)s: %(message)s"

# 定義不同的handler，輸出不同等級(jí)的日志消息
handlers:
    console:
        class: logging.StreamHandler # 輸出到控制臺(tái)
        level: DEBUG
        formatter: simple
        stream: ext://flask.logging.wsgi_errors_stream # 監(jiān)聽(tīng)flask日志
    info_file_handler:
        class: logging.handlers.RotatingFileHandler # 輸出到文件
        level: INFO
        formatter: simple
        filename: ./logs/info.log
        maxBytes: 10485760 # 10MB
        backupCount: 20 #most 20 extensions
        encoding: utf8
    error_file_handler:
        class: logging.handlers.RotatingFileHandler # 輸出到文件
        level: ERROR
        formatter: simple
        filename: ./logs/errors.log
        maxBytes: 10485760 # 10MB
        backupCount: 20
        encoding: utf8
# 啟用handler
root:
    level: INFO
    handlers: [console,info_file_handler,error_file_handler]

• 編寫Flask config.yaml

COMMON: &common
  # app設(shè)置
  DEBUG: False
  TESTING: False
  THREADED: False
  SECRET_KEY: insecure
  # 日志配置文件路徑
  LOGGING_CONFIG_PATH: ./config/logging.yaml
  # 日志文件存放位置
  LOGGING_PATH: ./logs
  
DEVELOPMENT: &development
  <<: *common
  DEBUG: True
  ENV:  dev
TESTING: &testing
  <<: *common
  ENV: test
  TESTING: True
  
PRODUCTION: &production
  <<: *common
  ENV: prod
  SECRET_KEY: shouldbereallysecureatsomepoint

• 運(yùn)行文件(run.py)

from app import factory

app = factory.create_app(config_name='DEVELOPMENT')

app.logger.info('A warning occurred (%d apples)', 42)
app.logger.error('An error occurred')
if __name__ == "__main__":
    app.run()

結(jié)果(自動(dòng)創(chuàng)建日志)