I am using my own stream handler as suggested in [1] to use tqdm with a logger.

class TqdmHandler(logging.StreamHandler):
    def __init__(self):
        logging.StreamHandler.__init__(self)

    def emit(self, record):
        msg = self.format(record)
        tqdm.write(msg)

The code crashes in some cases with "AttributeError: 'tqdm' object has no attribute ' when the tqdm.write(msg) command is issued. The culprit of the error is here: one of the elements in _instances has no attribute fp.

From what I can tell an instance object with no fp attribute is created by the __new__ method. Could it be the problem?