pip install python-dateutil
import datetime
from dateutil.relativedelta import relativedelta
now = datetime.date(2019, 7, 30)
print(now + relativedelta(months = 1))
print(now + relativedelta(years = 1))
print(now + relativedelta(days = 1))
pip install python-dateutil
import datetime
from dateutil.relativedelta import relativedelta
now = datetime.date(2019, 7, 30)
print(now + relativedelta(months = 1))
print(now + relativedelta(years = 1))
print(now + relativedelta(days = 1))