def tally_readings_per_second(data):
    time_tallies = dict()
    for item in data:
        key = item[0]
        if (key in time_tallies):
            time_tallies[key] = time_tallies[key] + 1
        else:
            time_tallies[key] = 1
    return time_tallies

def total_count_for_each_reading_per_second(time_tallies):
    tally_totals = dict()
    for val in time_tallies.values():
        if (val in tally_totals):
            tally_totals[val] = (tally_totals[val]) + 1
        else:
            tally_totals[val] = 1
    return tally_totals

def get_rps_above(threshold, readings):
    times = list()
    for k, v in readings.items():
        if (v >= threshold):
            times.append(k)
    return times

def find_flickers(selected_readings, all_readings):
    selected = dict()
    for current_selected_reading in selected_readings:
        readings = list()
        for current_reading in all_readings:
            if (current_selected_reading == current_reading[0]):
                readings.append(current_reading[1])
        selected[current_selected_reading] = readings
    return selected

def find_readings_with_lights_on(flicker_entries):
    filtered_readings = list()
    for time, reading in flicker_entries.items():
        for item in reading:
            val = int(item)
            if (val > 39):
                filtered_readings.append( (time, reading) )
    return filtered_readings