1 import logging
 2 
 3 
 4 # 簡單打印日誌舉例
 5 logging.basicConfig(level=logging.DEBUG)  # 設置日誌級別，WARN
 6 logging.warning(‘Watch out!‘)  # will print a message to the console
 7 logging.info(‘I told you so‘)  # will not print anything
 8 
 9 
10 # 打印日誌到文件,註意要新起一個文件，否則不能保存文件
11 def log_to_file(logs_dir="
 
D:\\test_data\\logs\\log_DEBUG.txt"):
12     logging.basicConfig(filename=logs_dir, level=logging.DEBUG)
13     logging.debug(‘This message should go to the log file‘)
14     logging.info(‘So should this‘)
15     logging.warning(‘And this, too‘)
16 
17 
18 log_to_file()
19 
20 # 多參數日誌
21 logging.warning(‘
 
%s before you %s‘, ‘Look‘, ‘leap!‘)
22 
23 # 日誌中打印時間
24 logging.basicConfig(format=‘%(asctime)s %(message)s‘)
25 logging.warning(‘is when this event was logged.‘)
26 
27 # 指定時間格式
28 logging.basicConfig(format=‘%(asctime)s %(message)s‘, datefmt=‘%Y-%m-%d %I:%M:%S %p‘)
29 logging.warning(‘is when this event was logged.
 
‘)

註意：logging的參數設置只在第一次運行之前有效，只能設置一次，後續設置無效。

指定時間格式運行結果：

1 # 指定時間格式
2 2017-08-12 10:47:07 PM is when this event was logged.

python之打印日誌logging