import datetime
path = '/my/path/to/file.csv'
while 1:
    name = input()
    date = datetime.datetime.now().strftime('%Y-%m-%d %H-%M-%S)
    presence = str(name) + ";" + str(date) + 'n'
    print(presence)

    file = open(path, "a+")
    file.write(presence)
    file.close()