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nannified.

This commit is contained in:
Guido van Rossum 1998-09-14 15:34:45 +00:00
parent a0f0a33d05
commit dcd038ff84
1 changed files with 70 additions and 70 deletions
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140
Demo/classes/Dates.py
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@ -39,11 +39,11 @@
# vi:set tabsize=8: # vi:set tabsize=8:
_MONTH_NAMES = [ 'January', 'February', 'March', 'April', 'May', _MONTH_NAMES = [ 'January', 'February', 'March', 'April', 'May',
'June', 'July', 'August', 'September', 'October', 'June', 'July', 'August', 'September', 'October',
'November', 'December' ] 'November', 'December' ]
_DAY_NAMES = [ 'Friday', 'Saturday', 'Sunday', 'Monday', _DAY_NAMES = [ 'Friday', 'Saturday', 'Sunday', 'Monday',
'Tuesday', 'Wednesday', 'Thursday' ] 'Tuesday', 'Wednesday', 'Thursday' ]
_DAYS_IN_MONTH = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ] _DAYS_IN_MONTH = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ]
@ -56,114 +56,114 @@
_INT_TYPES = type(1), type(1L) _INT_TYPES = type(1), type(1L)
def _is_leap( year ): # 1 if leap year, else 0 def _is_leap( year ): # 1 if leap year, else 0
if year % 4 != 0: return 0 if year % 4 != 0: return 0
if year % 400 == 0: return 1 if year % 400 == 0: return 1
return year % 100 != 0 return year % 100 != 0
def _days_in_year( year ): # number of days in year def _days_in_year( year ): # number of days in year
return 365 + _is_leap(year) return 365 + _is_leap(year)
def _days_before_year( year ): # number of days before year def _days_before_year( year ): # number of days before year
return year*365L + (year+3)/4 - (year+99)/100 + (year+399)/400 return year*365L + (year+3)/4 - (year+99)/100 + (year+399)/400
def _days_in_month( month, year ): # number of days in month of year def _days_in_month( month, year ): # number of days in month of year
if month == 2 and _is_leap(year): return 29 if month == 2 and _is_leap(year): return 29
return _DAYS_IN_MONTH[month-1] return _DAYS_IN_MONTH[month-1]
def _days_before_month( month, year ): # number of days in year before month def _days_before_month( month, year ): # number of days in year before month
return _DAYS_BEFORE_MONTH[month-1] + (month > 2 and _is_leap(year)) return _DAYS_BEFORE_MONTH[month-1] + (month > 2 and _is_leap(year))
def _date2num( date ): # compute ordinal of date.month,day,year def _date2num( date ): # compute ordinal of date.month,day,year
return _days_before_year( date.year ) + \ return _days_before_year( date.year ) + \
_days_before_month( date.month, date.year ) + \ _days_before_month( date.month, date.year ) + \
date.day date.day
_DI400Y = _days_before_year( 400 ) # number of days in 400 years _DI400Y = _days_before_year( 400 ) # number of days in 400 years
def _num2date( n ): # return date with ordinal n def _num2date( n ): # return date with ordinal n
if type(n) not in _INT_TYPES: if type(n) not in _INT_TYPES:
raise TypeError, 'argument must be integer: ' + `type(n)` raise TypeError, 'argument must be integer: ' + `type(n)`
ans = Date(1,1,1) # arguments irrelevant; just getting a Date obj ans = Date(1,1,1) # arguments irrelevant; just getting a Date obj
del ans.ord, ans.month, ans.day, ans.year # un-initialize it del ans.ord, ans.month, ans.day, ans.year # un-initialize it
ans.ord = n ans.ord = n
n400 = (n-1)/_DI400Y # # of 400-year blocks preceding n400 = (n-1)/_DI400Y # # of 400-year blocks preceding
year, n = 400 * n400, n - _DI400Y * n400 year, n = 400 * n400, n - _DI400Y * n400
more = n / 365 more = n / 365
dby = _days_before_year( more ) dby = _days_before_year( more )
if dby >= n: if dby >= n:
more = more - 1 more = more - 1
dby = dby - _days_in_year( more ) dby = dby - _days_in_year( more )
year, n = year + more, int(n - dby) year, n = year + more, int(n - dby)
try: year = int(year) # chop to int, if it fits try: year = int(year) # chop to int, if it fits
except (ValueError, OverflowError): pass except (ValueError, OverflowError): pass
month = min( n/29 + 1, 12 ) month = min( n/29 + 1, 12 )
dbm = _days_before_month( month, year ) dbm = _days_before_month( month, year )
if dbm >= n: if dbm >= n:
month = month - 1 month = month - 1
dbm = dbm - _days_in_month( month, year ) dbm = dbm - _days_in_month( month, year )
ans.month, ans.day, ans.year = month, n-dbm, year ans.month, ans.day, ans.year = month, n-dbm, year
return ans return ans
def _num2day( n ): # return weekday name of day with ordinal n def _num2day( n ): # return weekday name of day with ordinal n
return _DAY_NAMES[ int(n % 7) ] return _DAY_NAMES[ int(n % 7) ]
class Date: class Date:
def __init__( self, month, day, year ): def __init__( self, month, day, year ):
if not 1 <= month <= 12: if not 1 <= month <= 12:
raise ValueError, 'month must be in 1..12: ' + `month` raise ValueError, 'month must be in 1..12: ' + `month`
dim = _days_in_month( month, year ) dim = _days_in_month( month, year )
if not 1 <= day <= dim: if not 1 <= day <= dim:
raise ValueError, 'day must be in 1..' + `dim` + ': ' + `day` raise ValueError, 'day must be in 1..' + `dim` + ': ' + `day`
self.month, self.day, self.year = month, day, year self.month, self.day, self.year = month, day, year
self.ord = _date2num( self ) self.ord = _date2num( self )
# don't allow setting existing attributes # don't allow setting existing attributes
def __setattr__( self, name, value ): def __setattr__( self, name, value ):
if self.__dict__.has_key(name): if self.__dict__.has_key(name):
raise AttributeError, 'read-only attribute ' + name raise AttributeError, 'read-only attribute ' + name
self.__dict__[name] = value self.__dict__[name] = value
def __cmp__( self, other ): def __cmp__( self, other ):
return cmp( self.ord, other.ord ) return cmp( self.ord, other.ord )
# define a hash function so dates can be used as dictionary keys # define a hash function so dates can be used as dictionary keys
def __hash__( self ): def __hash__( self ):
return hash( self.ord ) return hash( self.ord )
# print as, e.g., Mon 16 Aug 1993 # print as, e.g., Mon 16 Aug 1993
def __repr__( self ): def __repr__( self ):
return '%.3s %2d %.3s ' % ( return '%.3s %2d %.3s ' % (
self.weekday(), self.weekday(),
self.day, self.day,
_MONTH_NAMES[self.month-1] ) + `self.year` _MONTH_NAMES[self.month-1] ) + `self.year`
# Python 1.1 coerces neither int+date nor date+int # Python 1.1 coerces neither int+date nor date+int
def __add__( self, n ): def __add__( self, n ):
if type(n) not in _INT_TYPES: if type(n) not in _INT_TYPES:
raise TypeError, 'can\'t add ' + `type(n)` + ' to date' raise TypeError, 'can\'t add ' + `type(n)` + ' to date'
return _num2date( self.ord + n ) return _num2date( self.ord + n )
__radd__ = __add__ # handle int+date __radd__ = __add__ # handle int+date
# Python 1.1 coerces neither date-int nor date-date # Python 1.1 coerces neither date-int nor date-date
def __sub__( self, other ): def __sub__( self, other ):
if type(other) in _INT_TYPES: # date-int if type(other) in _INT_TYPES: # date-int
return _num2date( self.ord - other ) return _num2date( self.ord - other )
else: else:
return self.ord - other.ord # date-date return self.ord - other.ord # date-date
# complain about int-date # complain about int-date
def __rsub__( self, other ): def __rsub__( self, other ):
raise TypeError, 'Can\'t subtract date from integer' raise TypeError, 'Can\'t subtract date from integer'
def weekday( self ): def weekday( self ):
return _num2day( self.ord ) return _num2day( self.ord )
def today(): def today():
import time import time
@ -175,30 +175,30 @@ def test( firstyear, lastyear ):
a = Date(9,30,1913) a = Date(9,30,1913)
b = Date(9,30,1914) b = Date(9,30,1914)
if `a` != 'Tue 30 Sep 1913': if `a` != 'Tue 30 Sep 1913':
raise DateTestError, '__repr__ failure' raise DateTestError, '__repr__ failure'
if (not a < b) or a == b or a > b or b != b: if (not a < b) or a == b or a > b or b != b:
raise DateTestError, '__cmp__ failure' raise DateTestError, '__cmp__ failure'
if a+365 != b or 365+a != b: if a+365 != b or 365+a != b:
raise DateTestError, '__add__ failure' raise DateTestError, '__add__ failure'
if b-a != 365 or b-365 != a: if b-a != 365 or b-365 != a:
raise DateTestError, '__sub__ failure' raise DateTestError, '__sub__ failure'
try: try:
x = 1 - a x = 1 - a
raise DateTestError, 'int-date should have failed' raise DateTestError, 'int-date should have failed'
except TypeError: except TypeError:
pass pass
try: try:
x = a + b x = a + b
raise DateTestError, 'date+date should have failed' raise DateTestError, 'date+date should have failed'
except TypeError: except TypeError:
pass pass
if a.weekday() != 'Tuesday': if a.weekday() != 'Tuesday':
raise DateTestError, 'weekday() failure' raise DateTestError, 'weekday() failure'
if max(a,b) is not b or min(a,b) is not a: if max(a,b) is not b or min(a,b) is not a:
raise DateTestError, 'min/max failure' raise DateTestError, 'min/max failure'
d = {a-1:b, b:a+1} d = {a-1:b, b:a+1}
if d[b-366] != b or d[a+(b-a)] != Date(10,1,1913): if d[b-366] != b or d[a+(b-a)] != Date(10,1,1913):
raise DateTestError, 'dictionary failure' raise DateTestError, 'dictionary failure'
# verify date<->number conversions for first and last days for # verify date<->number conversions for first and last days for
# all years in firstyear .. lastyear # all years in firstyear .. lastyear
@ -206,13 +206,13 @@ def test( firstyear, lastyear ):
lord = _days_before_year( firstyear ) lord = _days_before_year( firstyear )
y = firstyear y = firstyear
while y <= lastyear: while y <= lastyear:
ford = lord + 1 ford = lord + 1
lord = ford + _days_in_year(y) - 1 lord = ford + _days_in_year(y) - 1
fd, ld = Date(1,1,y), Date(12,31,y) fd, ld = Date(1,1,y), Date(12,31,y)
if (fd.ord,ld.ord) != (ford,lord): if (fd.ord,ld.ord) != (ford,lord):
raise DateTestError, ('date->num failed', y) raise DateTestError, ('date->num failed', y)
fd, ld = _num2date(ford), _num2date(lord) fd, ld = _num2date(ford), _num2date(lord)
if (1,1,y,12,31,y) != \ if (1,1,y,12,31,y) != \
(fd.month,fd.day,fd.year,ld.month,ld.day,ld.year): (fd.month,fd.day,fd.year,ld.month,ld.day,ld.year):
raise DateTestError, ('num->date failed', y) raise DateTestError, ('num->date failed', y)
y = y + 1 y = y + 1