获取python日志输出为字符串变量

import logging
import io


### Create the logger
logger = logging.getLogger('basic_logger')
logger.setLevel(logging.DEBUG)


### Setup the console handler with a StringIO object
log_capture_string = io.StringIO()
ch = logging.StreamHandler(log_capture_string)
ch.setLevel(logging.DEBUG)


### Optionally add a formatter
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
ch.setFormatter(formatter)


### Add the console handler to the logger
logger.addHandler(ch)




### Send log messages. 
logger.debug('debug message')
logger.info('info message')
logger.warn('warn message')
logger.error('error message')
logger.critical('critical message')




### Pull the contents back into a string and close the stream
log_contents = log_capture_string.getvalue()
log_capture_string.close()


### Output as lower case to prove it worked. 

print(log_contents.lower())