# python日志：logging模块使用
logging模块是Python内置的标准模块，主要用于输出运行日志，可以设置输出日志的等级、日志保存路径、日志文件回滚等, 记录运行时的过程
## 日志事件级别
级别排序：CRITICAL > ERROR > WARNING > INFO > DEBUG
默认等级： WARNING
## Logger
### 创建logger
```文章来源地址https://www.toymoban.com/news/detail-412015.html
import logging
logger = logging.getLogger(__name__) #默认root
```
### 设置日志记录的级别
```
level_relations = {
'debug': logging.DEBUG,
'info': logging.INFO,
'warning': logging.WARNING,
'error': logging.ERROR,
'crit': logging.CRITICAL
} # 日志级别关系映射
logger.setLevel(level_relations['debug'])
```
### 将日志内容传递到相关联的handlers中
```
logger.addHandler()
logger.removeHandler()
```
### Handlers处理器
### 输出到控制台
```
import logging
logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s %(filename)s %(levelname)s %(message)s',
datefmt='%a %d %b %Y %H:%M:%S'
)
logging.getLogger(__name__)
logging.info('info')
logging.debug('debug')
logging.warning('warning')
```
### 控制台输出参数
### 将日志同时输出到屏幕和日志文件
```
import logging.handlers
import logging.config
from sys import _getframe as get
import os
def create_file(filename):
if not os.path.exists(filename):
with open(filename, 'a', encoding='utf-8') as f:
pass
class Logger:
level_relations = {
'debug': logging.DEBUG,
'info': logging.INFO,
'warning': logging.WARNING,
'error': logging.ERROR,
'crit': logging.CRITICAL
} # 日志级别关系映射
# 第一种创建方式
def __init__(self, name, filename):
logger = logging.getLogger(name) # 创建日志对象
logger.setLevel(Logger.level_relations.get('debug')) # 设置日志等级
fmt = f'[{name} P- %(process)s T- %(thread)s %(funcName)s %(asctime)s %(message)s'
formatter = logging.Formatter(fmt, '%Y-%m-%d %H:%M:%S') # 时间格式
create_file(filename)
# 设置屏幕显示
consloe = logging.StreamHandler() # 控制台输出日志
consloe.setLevel(Logger.level_relations.get('info')) # 设置控制台输出日志级别
consloe.setFormatter(formatter) # 设置控制台打印格式
# 设置日志保存文件中
file_handler = logging.handlers.TimedRotatingFileHandler(filename, when='s', interval=2, backupCount=2, encoding='utf-8') # 这里我设置的是2秒产生1个日志文件， 保存近两天的日志
# when:h(时)/m(分)/s(秒)/d(天)/midnight(凌晨)等等, interval:间隔时间, backupCount=0 保存几天的日志
file_handler.setLevel(Logger.level_relations.get('info')) # 设置输出到日志文件等级
file_handler.setFormatter(formatter) # 设置写到日志文件格式
file_handler.suffix = '%Y-%m-%d_%M_%S' # 日志文件后缀
# 将日志内容传递到相关联的handlers中
logger.addHandler(consloe)
logger.addHandler(file_handler)
self.log = logger
def info(self, message):
# 调用该函数的函数文件名, 调用该函数的函数名字, 调用该函数的行号
self.log.info('info {} {} {} {}'.format(get(1).f_code.co_filename.split('/')[-1], get(1).f_code.co_name, get(1).f_lineno, message))
def error(self, message):
self.log.info('info {} {} {} {}'.format(get(1).f_code.co_filename.split('/')[-1], get(1).f_code.co_name, get(1).f_lineno, message))
```
### sys._getframe
```
import sys
sys._getframe().f_code.co_filename # 当前文件名，可以通过__file__获得
sys._getframe(0).f_code.co_name # 当前函数名
sys._getframe(1).f_code.co_name # 调用该函数的函数名字，如果没有被调用，则返回<module>
sys._getframe(0).f_lineno #当前函数的行号
sys._getframe(1).f_lineno # 调用该函数的行号
```
### logging.basicConfig(**kwargs)
```
# filename为空时默认屏幕输出,反之写入文件
# logging.basicConfig(level=logging.DEBUG,
# format='%(asctime)s %(filename)s %(levelname)s %(message)s',
# datefmt='%a %d %b %Y %H:%M:%S',
# filename='my.log',
# filemode='a'
# )
# 即写入文件， 又在屏幕输出
logging.basicConfig(level=logging.DEBUG,
format='%(asctime)s %(filename)s %(levelname)s %(message)s',
datefmt='%a %d %b %Y %H:%M:%S',
handlers=[logging.StreamHandler(), logging.FileHandler('my.log', encoding='utf-8')],
)
```
### dictConfig
```
# 通过YAML文件配置
import yaml
with open('common_config.yaml', 'r', encoding='utf-8') as f:
data = yaml.load(f, yaml.Loader)
config_d = data['log_config']
# 通过json
config_d = {
"version": 1,
"disable_existing_loggers": True,
"formatters": {
"standrd": {
"format": "%(asctime)s - %(name)s - %(levelname)s - %(message)s",
"datefmt": "%Y-%m-%d %H:%M:%S"
}
},
"handlers": {
"console": {
"class": "logging.StreamHandler",
"level": "DEBUG",
"formatter": "standrd",
"stream": "ext://sys.stdout"
},
"info_file_handler": {
"class": "logging.handlers.TimedRotatingFileHandler",
"level": "INFO",
"formatter": "standrd",
"filename": "C:/Users/huangxiangyi/Desktop/flask_ka/hxy_test/my.log",
"backupCount": 20,
"encoding": "utf8"
},
'loggers': {
'main': {
'level': 'INFO',
'propagate': False,
'handlers': ['console', 'info_file_handler']
}
},
},
"root": {
"level": "INFO",
"handlers": [
"console",
"info_file_handler"
]
}
}
logging.config.dictConfig(config_d)
logging.getLogger('main')
```
### common_config.yaml文件
```
# 日志配置,根据自己需要自行添加
url: &url C:/Users/huangxiangyi/Desktop/flask_ka/hxy_test/
log_config:
version: 1
disable_existing_loggers: true
formatters:
standrd:
format: "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
datefmt: "%Y-%m-%d %H:%M:%S"
handlers:
console:
class: logging.StreamHandler
level: DEBUG
formatter: standrd
stream: ext://sys.stdout
info_file_handler:
class: logging.handlers.TimedRotatingFileHandler
level: INFO
formatter: standrd
filename: !!python/object/apply:os.path.join [*url, my.log]
backupCount: 20
encoding: utf8
loggers:
main:
level: INFO
propagate: false
handlers: [console, info_file_handler]
root:
level: INFO
handlers: [console,info_file_handler]文章来源：https://www.toymoban.com/news/detail-412015.html
```
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