def filter_chars_and_normalize():
    global data
    for i in range(len(data)):
        if not data[i].isalnum():
            data[i] = ' '
        else:
            data[i] = data[i].lower()
Start the receive thread.
dataset/ETHPy150Open crista/exercises-in-programming-style/04-cookbook/tf-04.py/filter_chars_and_normalize--crossover with--dataset/ETHPy150Open mne-tools/mne-python/mne/realtime/fieldtrip_client.py/FieldTripClient.start_receive_thread