know LISP?
This is what the basic machinery of LISP looks like in Python:
def cons(a,b)
return [a,b]
should be:
return [a].extend(b)
def car(structure)
return structure[0]
def cdr(structure)
return structure[1]
should be:
return structure[1:]
B.
--
Brendon Towle
On 28 Sep 2006, at 8:05 AM, [EMAIL PROTECTED] wrote:
From: Bruno Desthuilliers [EMAIL PROTECTED]
Subject: Re: Questions on Using Python to Teach Data Structures and
Algorithms
To: python-list@python.org
Brendon Towle wrote:
Some of your Lisp translations are subtly off...
Seems
.)
I think I'd probably prefer:
def cons(a,b):
res = [a]
res.extend(b)
return res
because cons is supposed to leave its second argument untouched.
B.
--
Brendon Towle, PhD
Cognitive Scientist
+1-412-690-2442x127
Carnegie Learning, Inc.
The Cognitive Tutor Company ®
Helping over
Essentially, I'm looking for a Python equivalent to the ObjectiveC stuff that
can be found at:
http://developer.apple.com/documentation/UserExperience/Conceptual/AddressBook/index.html
Google got me that far, but was not particularly helpful past that.
Anyone have any pointers?
B.
--
On 12 Sep 2006, at 6:33 PM, [EMAIL PROTECTED] wrote:
Date: 12 Sep 2006 15:23:51 -0700
From: Simon Forman [EMAIL PROTECTED]
Subject: Re: Random Drawing Simulation -- performance issue
Brendon Towle wrote:
I need to simulate scenarios like the following: You have a deck of
3 orange cards, 5
, but this just might do the trick. Must ponder.
Thanks, everyone, for your helpful suggestions!
B.
--
Brendon Towle, PhD
Cognitive Scientist
+1-412-690-2442x127
Carnegie Learning, Inc.
The Cognitive Tutor Company ®
Helping over 375,000 students in 1000 school districts succeed in math.
--
http
):
index = random.choice(mapping)
res[index][0] += 1
return res
/code
--
Brendon Towle, PhD
Cognitive Scientist
+1-412-690-2442x127
Carnegie Learning, Inc.
The Cognitive Tutor Company ®
Helping over 375,000 students in 1000 school districts succeed in math.
--
http
suggestion of talking to
the server admin.
B.
--
Brendon Towle, Ph.D. [EMAIL PROTECTED] +1-412-362-1530
“Debugging is twice as hard as writing the code in the first place.
Therefore,
if you write the code as cleverly as possible, you are, by
definition, not
smart enough to debug it.” – Brian W
ort() return lst[:n]So, my question is: Someone obviously thought that it was wise and proper to require the longer versions that I write above. Why?B. -- Brendon Towle, PhDCognitive Scientist+1-412-690-2442x127Carnegie Learning, Inc.The Cognitive Tutor Company ®Helping over 375,000 students
Message: 3 Date: Fri, 25 Aug 2006 15:28:46 +0200 From: "Fredrik Lundh" [EMAIL PROTECTED] Subject: Re: Consistency in Python Brendon Towle wrote: So, my question is: Someone obviously thought that it was wise and proper to require the longer versions that I write above. Why? a) mayb
[3*y+x])... outlist.append(temp)outlist[['a', 'n', 't'], ['b', 'a', 't'], ['c', 'a', 't']] -- Brendon Towle, PhDCognitive Scientist+1-412-690-2442x127Carnegie Learning, Inc.The Cognitive Tutor Company ®Helping over 375,000 students in 1000 school districts succeed in math. --
http://mail.python.org/mailman/listinfo/python-list
great piece of code to parse a subset of pythonsafely:http://groups.google.ca/group/comp.lang.python/browse_frm/thread/8e427c5e6da35c/a34397ba74892b4eThis, as it turns out, was the most helpful pointer of them all -- thanks!B. -- Brendon Towle, PhDCognitive Scientist+1-412-690-2442x127Carnegie Learnin
r table_body = 'END_MARKER = '];' def extractStockData(data): pos1 = data.find(START_MARKER) pos2 = data.find(END_MARKER, pos1) parenPos = data.find('(') if parenPos = 0: raise "Data format changed -- found a paren" else: return eval(data[pos1+len(START
long before I call eval().2. Include it in the page I downloaded -- in this case, the function calls will be part of the string, and the data.pos('(') call will find them.Am I missing a third option? B.-- Brendon Towle, PhDCognitive Scientist+1-412-690-2442x127Carnegie Learning, Inc.The Cognitive
d the code actually works.)My question is: what's the safe way to do this?B. -- Brendon Towle, PhDCognitive Scientist+1-412-690-2442x127Carnegie Learning, Inc.The Cognitive Tutor Company ®Helping over 375,000 students in 1000 school districts succeed in math. --
http://mail.python.org/mailman/listinfo/python-list
e the re.* trick mentioned by another poster. But, doesn't it offend anyone else that the only clean way to access functionality that's already in Python is to write long complicated Python code? Python already knows how to extract a list object from a string; why should I have to rewrite that?B.On Wed, A
to exploit that identical-ness; apparently, all the clean ways are unsafe, and all the safe ways are unclean.B. -- Brendon Towle, PhDCognitive Scientist+1-412-690-2442x127Carnegie Learning, Inc.The Cognitive Tutor Company ®Helping over 375,000 students in 1000 school districts succeed in math
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