save_to_csv_when_exit.py

import time
import random
import pandas as pd
import datetime
import atexit

d = {
    'pressure': [],
    'temperature': [],
    'time':[]
}
df = pd.DataFrame(data=d)

def save_csv() -> None:
    time_now: str = datetime.datetime.now().strftime('%Y%m%d-%H%M-%S')
    df.to_csv(f"{time_now}.csv", index=False, date_format='%Y-%m-%d %H:%M:%S')
    print("Saved")

atexit.register(save_csv)

while True:
    measure_value = random.randrange(0, 100)
    measure_temperature = random.randrange(10, 30)
    time_now = pd.Timestamp.now()
    data = {
        'time':time_now,
        'pressure': measure_value,
        'temperature': measure_temperature,
    }
    df = df.append(data, ignore_index=True)
    print(data)

    time.sleep(1)