Printing Easter date occurrences

[buran]

1. you don't need self in calc_easter(). It's not a class attribute. Thus you don't need to pass date as first argument when call it.
2. when you pass date you pass just generic datetime.date object (i.e. not an instance) and when you print date.month it's just the attribute month of that date object.

from datetime import date
 
def calc_easter(year):
    "Returns Easter as a date object."
    a = year % 19
    b = year // 100
    c = year % 100
    d = (19 * a + b - b // 4 - ((b - (b + 8) // 25 + 1) // 3) + 15) % 30
    e = (32 + 2 * (b % 4) + 2 * (c // 4) - d - (c % 4)) % 7
    f = d + e - 7 * ((a + 11 * d + 22 * e) // 451) + 114
    month = f // 31
    day = f % 31 + 1    
    return date(year, month, day)
 
start_interval = 1950
end_interval = 2042
for year in range(start_interval, end_interval):
    easter = calc_easter(year=year)
    if easter.month == 4 and easter.day == 21:
        print(easter.strftime('%Y-%m-%d'))