Python get all the dates on Monday of this month

from datetime import date, timedelta, datetime
import calendar


cal = calendar.month(2019, 8)
print(cal)

m = datetime.now().month
y = datetime.now().year
ndays = (date(y, m + 1, 1) - date(y, m, 1)).days
day_one = date(y, m, 1)
last_day = date(y, m, ndays)
delta = last_day - day_one
data_list = []
for i in range(delta.days + 1):
    p = (day_one + timedelta(days=i)).strftime('%Y-%m-%d')
    pp = datetime.strptime(str(p), '%Y-%m-%d')
    one = pp.isoweekday()
    print(type(one), one)
    if one == 1:    # 1 为周一
        d2 = pp.strftime('%Y-%m-%d')
        data_list.append(d2)

print(data_list)