開始日と終了日のリストから逃した日を特定するにはどうすればよいですか？

Question

(start_date, end_date)タプルのリストから欠落している日付を特定する方法を教えてください。

• 2011-02-152011-02-28から
• 2011-03-15

：上記の例は以下の欠落の日付を持ってい

dates = [('2011-01-01', '2011-01-14'), ('2011-01-15','2011-01-31'), 
     ('2011-02-01', '2011-02-14'), ('2011-03-01', '2011-03-14'), 
     ('2011-03-16', '2011-03-31')] 

：たとえば、どのように下のリストに欠けている日付を特定する

どのようにすべてのm開始日と終了日のタプルのリストから日を発行しますか？

Answer 1

ビット冗長、あなたのアイデア

EDIT取得：は

from datetime import date, timedelta 

dates = [('2011-01-01', '2011-01-14'), ('2011-01-15','2011-01-31'), 
     ('2011-02-01', '2011-02-14'), ('2011-03-01', '2011-03-14'), 
     ('2011-03-16', '2011-03-31')] 

def d_range(d1,d2): 
    delta = d2 - d1 #assumes second date is always after first 
    return [d1 + timedelta(days=i) for i in range(delta.days + 1)] 

my_days = [] 

#calc the date range between each tuple 
for d in dates: 

    d1 = datetime.strptime(d[0],'%Y-%m-%d') 
    d2 = datetime.strptime(d[1],'%Y-%m-%d') 

    my_days.extend(d_range(d1,d2)) 


#now do the same for the max and min dates 
my_range = d_range(min(my_days), max(my_days)) 


missing_dates = set(my_range).difference(set(my_days)) 

少しそれをクリーンアップとあなたのコメントに対処するために：

missing_dates_list = list(missing_dates) 

やバックthierにします元の形式：

missing_dates_str = [datetime.strftime(date, '%Y-%m-%d') for date in missing_dates] 

より多くのオブジェクト指向の方法で

Answer 2

ソリューション：

from functools import total_ordering 
from datetime import timedelta, datetime 


@total_ordering 
class DateRange(object): 
    def __init__(self, start, end): 
     assert start <= end 
     self.start = start 
     self.end = end 

    def __contains__(self, other): 
     return self.start <= other and self.end >= other 

    def __lt__(self, other): 
     if self.start == other.start: 
      return self.end < other.end 
     return self.start < other.start 

    def __eq__(self, other): 
     return self.start == other.start and self.end == other.end 

    def __str__(self): 
     return '<%s, %s>' % (self.start.strftime('%Y-%m-%d'), self.end.strftime('%Y-%m-%d')) 

    def __iter__(self): 
     class DateIterator(object): 
      def __init__(self, start, end): 
       self.current = start 
       self.end = end 

      def next(self): 
       if self.current > self.end: 
        raise StopIteration() 
       self.current += timedelta(days=1) 
       return self.current 

     return DateIterator(self.start, self.end) 

    __repr__ = __str__ 

dates = [('2011-01-01', '2011-01-14'), ('2011-01-15','2011-01-31'), ('2011-02-01','2011-02-14'), ('2011-03-01','2011-03-14'), ('2011-03-16','2011-03-31')] 
dates = [DateRange(datetime.strptime(start, '%Y-%m-%d'), datetime.strptime(end, '%Y-%m-%d')) for start, end in dates] 
dates = sorted(dates) 

missing = [] 

previous = None 
for date_range in dates: 
    if previous is not None and previous < date_range.start: 
     missing.append(DateRange(previous, date_range.start + timedelta(days=-1))) 

    previous = date_range.end + timedelta(days=1) 

print missing