Python logging_basic opreation

官方文件

用於記錄程式執行間的錯誤訊息、執行訊息…等你想記錄的訊息，不需要再自己寫log的function來記錄了。
下面的部份設置之後，已經足夠應付一般應用了(文件說的)
有需求的部份，可以再學習進階版，不過要自備飲料!(也是文件上說的)

logging.basicConfig設置

basicConfig的設置，必需在一開始的時候就設置了，一但執行了其它method之後再調整，理論上是不會有任何的作用的。
如真的希望調整，就必需透過filemode來處理了。

logging.basicConfig(filename='example.log', filemode='w', level=logging.DEBUG)

這時候如果檔名一致的話，就會直接蓋掉了，要注意。

設置記錄層級與檔名

設置檔案名稱為example.log，並且記錄層級調整為DEBUG.

logging.basicConfig(filename='example.log', level=logging.DEBUG)

改變訊息格式

透過basicConfig內的format參數可以調整log的格式!

levelname、message

如果你想調整你的記錄訊息格式的話，可以透過format來處理。
在執行method的時候，內文就是參數message了。

import logging
logging.basicConfig(format='%(levelname)s:%(message)s', level=logging.DEBUG, filemode='w')
logging.debug('This message should appear on the console')
#  結果
#DEBUG:This message should appear on the console

asctime、created

import logging
logging.basicConfig(format='%(asctime)s,%(created)f:%(message)s', level=logging.DEBUG, filemode='w')
logging.warning('This message should appear on the console')
#  結果
#2017-10-30 11:45:14,710,1509335114.710247:This message should appear on the console

asctime的部份還可以透過參數datefmt來設置格式，格式設置方式與time.strftime()相同。

import logging
logging.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p')
logging.warning('is when this event was logged.')

filename、funcName

import logging
logging.basicConfig(format='%(filename)s, %(funcName)s:%(message)s', level=logging.DEBUG, filemode='w')
logging.warning('filename and funcName.')
#  結果
#<stdin>, <module>:filename and funcName.

levelname、levelno

import logging
logging.basicConfig(format='%(levelname)s, %(levelno)s:%(message)s', level=logging.DEBUG, filemode='w')
logging.warning('levelname and levelno.')
#  結果
#<WARNING, 30:levelname and levelno.

name、pathname、relativeCreated

import logging
logging.basicConfig(format='%(name)s,%(pathname)s,%(relativeCreated)d:%(message)s', level=logging.DEBUG, filemode='w')
logging.warning('name、pathname、relativeCreated')
#  結果
#root,<stdin>,476:name、pathname、relativeCreated

lineno、module、msecs

格式清單

還蠻多不懂的，要一個一個測試

Attribute name	Format Description	Description
args	You shouldn’t need to format this yourself.
asctime	%(asctime)s	log建立的時間，格式為’2003-07-08 16:49:45,896’(人類可讀時間)
created	%(created)f	log建立的時間，格式為time.time…‘1509332841.1471474’
exc_info	You shouldn’t need to format this yourself.	Exception tuple (à la sys.exc_info) or, if no exception has occurred, None.
filename	%(filename)s	含部份路徑的檔案名稱
funcName	%(funcName)s	產生該log的function名稱
levelname	%(levelname)s	記錄層級名稱(DEBUG、INFO、…)
levelno	%(levelno)s	記錄層級數值(10、20、…
lineno	%(lineno)d	產生該log的行數
module	%(module)s	Module (name portion of filename).
msecs	%(msecs)d	log建立的時間的毫秒
message	%(message)s	記錄的訊息
msg	You shouldn’t need to format this yourself.	The format string passed in the original logging call. Merged with args to produce message, or an arbitrary object (see Using arbitrary objects as messages).
name	%(name)s	Name of the logger used to log the call.
pathname	%(pathname)s	產生該log的來源文件完整路徑
process	%(process)d	ProcessID
processName	%(processName)s	ProcessName
relativeCreated	%(relativeCreated)d	Time in milliseconds when the LogRecord was created, relative to the time the logging module was loaded.
stack_info	You shouldn’t need to format this yourself.	Stack frame information (where available) from the bottom of the stack in the current thread, up to and including the stack frame of the logging call which resulted in the creation of this record.
thread	%(thread)d	Thread ID
threadName	%(threadName)s	Thread Name

記錄層級

層級	層級數值
CRITICAL	50
ERROR	40
WARNING	30
INFO	20
DEBUG	10
NOTSET	0