date.day（）返回TypeError：'int'對象不可調用

Question

我卡住了。看起來這一天似乎被某個地方的int所覆蓋。但是哪裏？一天成爲一個整數在哪裏？

from datetime import * 

start_date = date(1901, 1, 1) 
end_date = date(2000, 12, 31) 
sundays_on_1st = 0 

def daterange(start_date, end_date): 
    for n in range(int ((end_date - start_date).days)): 
     yield start_date + timedelta(n) 

for single_date in daterange(start_date, end_date): 

    # type(single_date) => <type 'datetime.date'> 
    # type(date.day()) => TypeError: 'getset_descriptor' object is not callable 
    # type(single_date.day()) => TypeError: 'int' object is not callable 
    # ಠ_ಠ 

    if single_date.day() == 1 and single_date.weekday() == 6: 
     sundays_on_1st += 1          

print sundays_on_1st 

Answer 1

.day不是一種方法，你不需要調用它。只有.weekday()是一種方法。

if single_date.day == 1 and single_date.weekday() == 6: 
    sundays_on_1st += 1          

這只是正常：

>>> for single_date in daterange(start_date, end_date): 
...  if single_date.day == 1 and single_date.weekday() == 6: 
...   sundays_on_1st += 1 
... 
>>> print sundays_on_1st 
171 
>>> type(single_date.day) 
<type 'int'> 

從datetime.date documentation：

Instance attributes (read-only):

date.year
Between MINYEAR and MAXYEAR inclusive.

date.month
Between 1 and 12 inclusive.

date.day
Between 1 and the number of days in the given month of the given year.

它是作爲一個數據描述符（如property）來實現，使其只讀，因此您看到的TypeError: 'getset_descriptor' object is not callable錯誤。