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
