Appending to list in Python dictionary

dico_list.py

from datetime import datetime

dico = dict()
dico.setdefault('42', []).append(datetime.now().strftime("%d-%m-%Y %H:%M:%S:%f"))
dico.setdefault('42', []).append(datetime.now().strftime("%d-%m-%Y %H:%M:%S:%f"))
dico.setdefault('777', []).append(datetime.now().strftime("%d-%m-%Y %H:%M:%S:%f"))
dico.setdefault('777', []).append(datetime.now().strftime("%d-%m-%Y %H:%M:%S:%f"))
print(dico)


## Output ##
# {'42': ['08-01-2020 15:23:18:424524', '08-01-2020 15:23:18:424539'], 
#  '777': ['08-01-2020 15:23:18:424543', '08-01-2020 15:23:18:424545']}