它可以像登录到StringIO对象一样简单：
import logging
try:
from cStringIO import StringIO # Python 2
except ImportError:
from io import StringIO
log_stream = StringIO()
logging.basicConfig(stream=log_stream, level=logging.INFO)
logging.info('hello world')
logging.warning('be careful!')
logging.debug("you won't see this")
logging.error('you will see this')
logging.critical('critical is logged too!')
print(log_stream.getvalue())
INFO：root：hello world
警告：root：请小心！
错误：根：您将看到此
也记录了CRITICAL：root：critical！
如果您只想记录WARN，INFO和ERROR级别的消息，则可以使用过滤器进行记录。LevelFilter下面检查每个日志记录的级别号，仅允许所需级别的那些记录：
import logging
try:
from cStringIO import StringIO # Python 2
except ImportError:
from io import StringIO
class LevelFilter(logging.Filter):
def __init__(self, levels):
self.levels = levels
def filter(self, record):
return record.levelno in self.levels
log_stream = StringIO()
logging.basicConfig(stream=log_stream, level=logging.NOTSET)
logging.getLogger().addFilter(LevelFilter((logging.INFO, logging.WARNING, logging.ERROR)))
logging.info('hello world')
logging.warning('be careful!')
logging.debug("you won't see this")
logging.error('you will see this')
logging.critical('critical is no longer logged!')
print(log_stream.getvalue())
INFO：root：hello world
警告：root：请小心！
错误：根：您将看到此
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