[Python-checkins] python/dist/src/Lib calendar.py,1.30,1.31

[rhettinger@users.sourceforge.net]

Update of /cvsroot/python/python/dist/src/Lib
In directory sc8-pr-cvs1:/tmp/cvs-serv24875/Lib

Modified Files:
	calendar.py 
Log Message:
SF 658405:  calendar.py to rely on the datetime module instead of the time
module.

The code is shorter, more readable, faster, and dramatically increases the
range of acceptable dates.

Also, used the floor division operator in leapdays().


Index: calendar.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/calendar.py,v
retrieving revision 1.30
retrieving revision 1.31
diff -C2 -d -r1.30 -r1.31
*** calendar.py	22 Oct 2002 05:15:17 -0000	1.30
--- calendar.py	25 Dec 2002 16:37:19 -0000	1.31
***************
*** 6,13 ****
  set the first day of the week (0=Monday, 6=Sunday)."""
  
! # Revision 2: uses functions from built-in time module
! 
! # Import functions and variables from time module
! from time import localtime, mktime, strftime
  
  __all__ = ["error","setfirstweekday","firstweekday","isleap",
--- 6,10 ----
  set the first day of the week (0=Monday, 6=Sunday)."""
  
! import datetime
  
  __all__ = ["error","setfirstweekday","firstweekday","isleap",
***************
*** 36,40 ****
  
      def __getitem__(self, i):
!         data = [strftime(self.format, (2001, j, 1, 12, 0, 0, 1, 1, 0))
                       for j in range(1, 13)]
          data.insert(0, "")
--- 33,37 ----
  
      def __getitem__(self, i):
!         data = [datetime.date(2001, j, 1).strftime(self.format)
                       for j in range(1, 13)]
          data.insert(0, "")
***************
*** 50,54 ****
      def __getitem__(self, i):
          # January 1, 2001, was a Monday.
!         data = [strftime(self.format, (2001, 1, j+1, 12, 0, 0, j, j+1, 0))
                       for j in range(7)]
          return data[i]
--- 47,51 ----
      def __getitem__(self, i):
          # January 1, 2001, was a Monday.
!         data = [datetime.date(2001, 1, j+1).strftime(self.format)
                       for j in range(7)]
          return data[i]
***************
*** 90,101 ****
      y1 -= 1
      y2 -= 1
!     return (y2/4 - y1/4) - (y2/100 - y1/100) + (y2/400 - y1/400)
  
  def weekday(year, month, day):
      """Return weekday (0-6 ~ Mon-Sun) for year (1970-...), month (1-12),
         day (1-31)."""
!     secs = mktime((year, month, day, 0, 0, 0, 0, 0, 0))
!     tuple = localtime(secs)
!     return tuple[6]
  
  def monthrange(year, month):
--- 87,96 ----
      y1 -= 1
      y2 -= 1
!     return (y2//4 - y1//4) - (y2//100 - y1//100) + (y2//400 - y1//400)
  
  def weekday(year, month, day):
      """Return weekday (0-6 ~ Mon-Sun) for year (1970-...), month (1-12),
         day (1-31)."""
!     return datetime.date(year, month, day).weekday()
  
  def monthrange(year, month):
***************
*** 214,228 ****
  
  EPOCH = 1970
  def timegm(tuple):
      """Unrelated but handy function to calculate Unix timestamp from GMT."""
      year, month, day, hour, minute, second = tuple[:6]
!     assert year >= EPOCH
!     assert 1 <= month <= 12
!     days = 365*(year-EPOCH) + leapdays(EPOCH, year)
!     for i in range(1, month):
!         days = days + mdays[i]
!     if month > 2 and isleap(year):
!         days = days + 1
!     days = days + day - 1
      hours = days*24 + hour
      minutes = hours*60 + minute
--- 209,218 ----
  
  EPOCH = 1970
+ _EPOCH_ORD = datetime.date(EPOCH, 1, 1).toordinal()
+ 
  def timegm(tuple):
      """Unrelated but handy function to calculate Unix timestamp from GMT."""
      year, month, day, hour, minute, second = tuple[:6]
!     days = datetime.date(year, month, day).toordinal() - _EPOCH_ORD
      hours = days*24 + hour
      minutes = hours*60 + minute