Why there's a 'blank line' on CSV file?

[brunolelli]

Hello guys,

With the following code I'm exporting my data to a CSV file:

from tempfile import NamedTemporaryFile
from FlightRadar24.api import FlightRadar24API
from time import time, sleep
from datetime import datetime
import shutil
import csv
import threading
import schedule 
import time 
import sched, time

s = sched.scheduler(time.time, time.sleep)
def do_something(sc): 
    print("Doing stuff...")

    now = datetime.now()
    dt_string = now.strftime("%d/%m/%Y %H:%M:%S")
    company1 = len(fr_api.get_flights(airline = 'AZU'))
    company2 = len(fr_api.get_flights(airline = 'GLO'))
    company3 = len(fr_api.get_flights(airline = 'LAN'))
    company4 = len(fr_api.get_flights(airline = 'PTB'))
    
    print(dt_string, company1, company2, company3, company4)
    fields=[dt_string,company1,company2,company3,company4]


    with open(r'C:\Users\bruno\Desktop\Voos\Voos.csv', 'a') as f:
        writer = csv.writer(f, delimiter=';')
        writer.writerow(fields)   

    
    s.enter(60, 1, do_something, (sc,))

s.enter(60, 1, do_something, (s,))
s.run()

When I print it, I get the values line by line...

print(dt_string, company1, company2, company3, company4)


23/03/2021 09:09	50	18	34	1				
23/03/2021 09:09	50	18	34	1				
23/03/2021 09:09	50	19	34	1				
23/03/2021 09:09	50	19	34	1				
23/03/2021 09:09	50	19	34	1				
23/03/2021 09:09	51	19	34	1				
23/03/2021 09:09	51	19	34	1				
23/03/2021 09:09	51	19	34	1

But when I open my csv file, the results are separated by an empty line... like this:

23/03/2021 09:09	50	18	34	1
				
23/03/2021 09:09	50	18	34	1
				
23/03/2021 09:09	50	19	34	1
				
23/03/2021 09:09	50	19	34	1
				
23/03/2021 09:09	50	19	34	1
				
23/03/2021 09:09	51	19	34	1
				
23/03/2021 09:09	51	19	34	1
				
23/03/2021 09:09	51	19	34	1

What's going on?
How can I fix it, and get the values on my csv file without the blank line?

Thank you!