Why the blank lines in output?

[Mark17]

My guess is the occasional blank like is from something you did not post. I would comment out the print and see if the blank lines still appear.

That whole block looks like this:

if current_date != current_date_prev: #debug
    daily_mode_counter += 1
    print(f'current_date is {current_date}, common date is {datetime.utcfromtimestamp(current_date*86400).strftime("%Y-%m-%d")}, trade status is {trade_status}, and control flag is {control_flag}123456789.')
    current_date_prev = current_date
    if daily_mode_counter > 500:
        raise ValueError('daily_mode_counter > 100') #I forgot to include a line to increment counter on each pass
else: pass

Only the ValueError prints out if I comment out L3.