log_to_stringio.py

import logging
import time
import threading
import io


def log_info(message,logger):
    logger.info(message)
    time.sleep(3)
    logger.info(message)


logger = logging.getLogger(__name__) 
logger.setLevel(logging.INFO)

stream = io.StringIO()
ch = logging.StreamHandler(stream)
ch.setLevel(logging.DEBUG)
logger.addHandler(ch)



threads = []
for i in range(10):
    t = threading.Thread(
        target=log_info, args=("Hello from thread {}".format(i),logger)
    )
    
    threads.append(t)

# Start the threads
for t in threads:
    t.start()

# Wait for the threads to complete
for t in threads:
    t.join()

log_contents = stream.getvalue() 
stream.close()
print(log_contents)