Thank you for all your help and time. You really helped me a lot.
As a final note, I think that func.info.end_time = time.time() + seconds 
should be written outside wrapper, because end_time will be rewritten each 
time func is called (there is some recursion inside my algo), but overall 
this approach works perfectly.

import functools

def time_limit(seconds):
    def decorator(func):
        func.info = threading.local()
        *func.info.end_time = time.time() + seconds*

        def check_timeout():
            if time.time() > func.info.end_time:
                raise TimeoutException

        func.check_timeout = check_timeout

        @functools.wraps(func)
        def wrapper(*args, **kwargs):
            return func(*args, **kwargs)

        return wrapper

    return decorator

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