队列使用者打印与日志记录[重复]

在调试下面的队列示例时,我发现了一个奇怪的行为(对我来说)与Python3.6中的print函数有关。下面的代码按预期工作,但是,如果我在下面的消费者函数中将“logger.info”更改为“print”函数,消费者函数将挂起。为什么会这样?

from queue import Queue
from threading import Thread
import logging

logging.basicConfig(format='%(asctime)s; %(name)s; %(levelname)s; %(message)s', level=logging.DEBUG)
logger = logging.getLogger(__name__)
logger.info('Starting...')


def consumer(q):
    while True:
        item = q.get()
        logger.info ("Working on item: {}".format(item))


def main():
    q = Queue()

    t = Thread(target=consumer, args=(q,))
    t.start()

    for i in range(3):
        q.put(i)

if __name__ == '__main__':
    main()

输出1:

2018-02-20 09:24:29,630; __main__; INFO; Starting...
2018-02-20 09:24:29,631; __main__; INFO; Working on item: 0
2018-02-20 09:24:29,631; __main__; INFO; Working on item: 1
2018-02-20 09:24:29,631; __main__; INFO; Working on item: 2

输出2:

2018-02-20 09:26:14,497; __main__; INFO; Starting...