On Wed, Sep 29, 2010 at 1:53 PM, Dave Angel <da...@ieee.org> wrote:
> On 9/28/2010 5:11 PM, Carter Danforth wrote:
>
>> Thanks for the replies, Dave and Joel. The reason I'm not just using the
>> time or datetime modules for a random date is because it's restricted to
>> 1970-2038; I'm pulling dates from 1600-3099. Thanks a lot for the pointer
>> about the leap years, Dave, as well the class instances; just updated it
>> and
>> it's all working now, and also included the rest of the code too w/ answer
>> verification and time tracking.
>>
>> I want to start using this program to test myself for speed calculation
>> using Zeller's formula, it's pretty cool for determining the days of dates
>> -
>> http://mathforum.org/dr/math/faq/faq.calendar.html
>>
>> Because of the way variables C and D are split up from the year in the
>> formula, I split up the year for self.c and self.y.
>>
>> ------------------------
>>
>> import random, time, datetime, calendar
>>
>> class Date:
>> def __init__(self):
>> self.c = random.randint(16,30)
>> self.y = random.randint(0,99)
>> self.month = random.randint(1,12)
>> self.year = self.c*100 + self.y
>>
>> apr = [4,6,9,11]
>> feb = [2]
>> notleap = [1700, 1800, 1900, 3000]
>>
>> if self.month in feb:
>> if self.year%4 == 0:
>> if self.year in notleap:
>> self.k = random.randint(1,28)
>> else:
>> self.k = random.randint(1,29)
>> else:
>> self.k = random.randint(1,28)
>> elif self.month in apr:
>> self.k = random.randint(1,30)
>> else:
>> self.k = random.randint(1,31)
>>
>> if self.month in [1,2]:
>> d = self.y - 1
>> m = self.month + 10
>> else:
>> d = self.y
>> m = self.month - 2
>>
>> z = self.k + (13*m-1)/5 + d + d/4 + self.c/4 - 2*self.c
>>
>> if z< 0:
>> r = (abs(z)/7)*7 + z + 7
>> else:
>> r = z%7
>>
>> dict = { 0: 'Sunday', 1: 'Monday', 2: 'Tuesday', 3: 'Wednesday',
>> 4:
>> 'Thursday', 5: 'Friday', 6: 'Saturday' }
>> self.day = dict[r]
>>
>> t1m = time.localtime().tm_min
>> t1s = time.localtime().tm_sec
>> t1 = t1m + t1s/100.0
>> n = 0
>> x = 0
>>
>> while n< 10:
>> newdate = Date()
>>
>> print '\n',calendar.month_name[newdate.month], newdate.k,',',
>> newdate.year,'=',
>> answer = raw_input()
>> if answer.capitalize() == newdate.day:
>> pass
>> else:
>> x += 1
>> n += 1
>>
>> t2m = time.localtime().tm_min
>> t2s = time.localtime().tm_sec
>> t2 = t2m + t2s/100.0
>> td = t2 - t1
>>
>> print '\n',x,'out of 10 wrong\nAvg time/question:',td/10,'\nTotal
>> time:',td
>>
>> <snip>
>>
>> You top-posted again. Put your comments after the part you're quoting,
> not before.
>
> You still have a problem in the code, and I still think it's in the
> 2*self.c, though I don't have time to debug it.
>
> Look up the day for 1/1/2099, and for 1/1/2100 and it comes out the same.
> That's not correct. No adjacent years start on the same day, it's always
> either one day or two.
>
> You have too much in one function (method), which makes it hard to debug
> it. Factor it into separate functions, and then test each independently.
> And using k for day and d for year make no sense to me, though perhaps it
> does in some other language.
>
> DaveA
>
>
Hey Dave, you probably left c and y alone when comparing the years. If the
date's 1/1/2099, then self.c = 20 and self.y=99. If you try doing it again
while changing those values, for 1/1/2099, the day comes out to be Thursday,
and for 1/1/2100 you'll get Wednesday.
Glad you pointed out the 2100 date though, there actually was a problem in
it, but it's not the 2*self.c; I had to account for d = y - 1 when y = 00
(zeller subtracts months by 2, so it needs to be the previous yr for
jan/feb).
Below is the updated code, I put in a few comments to make it read easier.
----------------------
import random, time, datetime, calendar
class Date:
def __init__(self):
self.c = random.randint(16,30) # first two digits in a year
self.y = random.randint(0,99) # last two digits in a year
self.month = random.randint(1,12)
self.year = self.c*100 + self.y
apr = [4,6,9,11]
feb = [2]
notleap = [1700, 1800, 1900, 2100, 2200, 2300, 2500, 2600, 2700,
2900, 3000]
if self.month in feb: # assigns days, given the month
if self.year%4 == 0:
if self.year in notleap:
self.k = random.randint(1,28)
else:
self.k = random.randint(1,29)
else:
self.k = random.randint(1,28)
elif self.month in apr:
self.k = random.randint(1,30)
else:
self.k = random.randint(1,31)
if self.month in [1,2]: # months in zeller's rule are
subtracted by 2
if self.y == 0: # need to acct for jan/feb year
change
d = 99
m = self.month + 10
else:
d = self.y - 1
m = self.month + 10
else:
d = self.y
m = self.month - 2
z = self.k + (13*m-1)/5 + d + d/4 + self.c/4 - 2*self.c # -->
Zeller's formula
if z < 0: # the remainder of z/7 determines the
day of the week
r = (abs(z)/7)*7 + z + 7 # need to account for negative z
values by adding 7 to remainder
else:
r = z%7
week =
('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday')
self.day = week[r]
t1m = time.localtime().tm_min
t1s = time.localtime().tm_sec
t1 = t1m + t1s/100.0
n = 0
x = 0
while n < 10:
newdate = Date()
print '\n ',calendar.month_name[newdate.month], str(newdate.k) +
',',newdate.year,'=',
answer = raw_input()
if answer.capitalize() == newdate.day:
pass
else:
x += 1
n += 1
t2m = time.localtime().tm_min
t2s = time.localtime().tm_sec
t2 = t2m + t2s/100.0
td = t2 - t1
print '\n',x,'out of 10 wrong\nAvg time/question:',td/10,'\nTotal time:',td
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