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[Tutor] help with augumented assignment y += 1
Hello,
I am writing a poll application, which has two XML files:
1) survey.xml
?xml version=1.0 encoding=UTF-8?
survey
question code=a1 type=MCQ
titleIs an augumented assignment such as 'x = x + 1' the same as x
+= 1?/title
optionYes/option
optionNo/option
optionDon't know/option
/question
question code=a2 type=MAQ
titleThe statement 'x *= y + 1' is equivalent to:/title
option'x = (x * y) + 1'/option
option'x = x * (y + 1)/option
option'x = (y + 1) * x'/option
optionAll of the above/option
/question
/survey
2) respons.xml
?xml version=1.0 encoding=UTF-8?
response
attempt username=1 date=2008-07-28 14:40
question code=a1
answer1/answer
/question
question code=a2
answer2/answer
answer3/answer
/question
/attempt
attempt username=5 date=2008-07-28 15:00
question code=a1
answer1/answer
/question
question code=a2
answer1/answer
answer2/answer
/question
/attempt
attempt username=3 date=2008-07-28 14:47
question code=a1
answer3/answer
/question
question code=a2
answer4/answer
/question
/attempt
/response
Here is the code I have so far, poll.py:
from folder import Folder
from handlers import Text
...
class Survey(Text):
Here we create the actual survey.xml file
def new(self):
self.questions = {}
def _load_state_from_file(self, file):
def to_str(self, encoding='UTF-8'):
lines = ['?xml version=1.0 encoding=%s?\n' % encoding,
'survey\n']
# Business functions
# Questions
questions = self.questions
codes = questions.keys()
codes.sort()
for code in codes:
lines.append(questions[code].to_str(encoding))
lines.append('/survey')
return ''.join(lines)
class Response(Text):
Here we create the actual response.xml file
def new(self):
self.attempts = {}
def _load_state_from_file(self, file):
# TEST 015
attempts = {}
def to_str(self, encoding='UTF-8'):
lines = ['?xml version=1.0 encoding=%s?' % encoding,
'response']
attempts = self.attempts
for username in attempts:
for attempt in attempts[username]:
lines.append(
'attempt username=%s date=%s mark=%2.2f'
% (username, attempt.date.strftime('%Y-%m-%d
%H:%M'), attempt.mark))
questions = attempt.questions
for question_code in questions:
lines.append(' question code=%s' % question_code)
for answer in questions[question_code]:
lines.append('answer%s/answer' % answer)
lines.append(' /question')
lines.append('/attempt')
lines.append('/response')
return '\n'.join(lines)
def get_analysis(self):
attempts = self.attempts
for username in attempts:
user = []
question = []
for attempt in attempts[username]:
user.append(username)
questions = attempt.questions
answers = []
for question_code in questions:
for answer in questions[question_code]:
answers.append(answer)
question.append(question_code)
# [SEE NOTE 1]
print user, question, answers
class Attempt(object):
def __init__(self, username=None, date=None):
self.username = username
self.date = date
self.questions = {}
class Poll(Folder):
def new(self):
Folder.new(self)
self.cache['.survey'] = Survey()
self.cache['.response'] = Response()
def get_definition(self):
return self.get_handler('.survey')
definition = property(get_definition, None, None, '')
def get_results(self):
return self.get_handler('.response')
results = property(get_results, None, None, '')
def fill_form(self, context):
user = context.user
...
def analyse(self, context):
user, root = context.user, context.root
questions = self.definition.questions
results = [{'question': x,
'title': y.title,
'options': [y.options]}
for x, y in questions.items()]
# [SEE NOTE 2]
print results
[NOTE 1] In the Response class I have a function 'get_analysis':
def get_analysis(self):
attempts = self.attempts
This returns:
['1'] ['1', '2', '2', '2'] [1, 1, 2, 4]
['0'] ['1', '2', '2'] [2, 2, 3]
[NOTE 2] In the Poll class, I have a function 'analyse':
def analyse(self, context):
user, root = context.user, context.root
questions = self.definition.questions
...
This returns:
[{'question': 'a1', 'options': [[u'Yes', u'No', uDon't know]],
'title': uIs
Re: [Tutor] How to run a Python program under Windows.
Morgan Thorpe wrote: Hey Again. Okay i don't think my sad explantion did help at all. Would you be able to explain step by step what i need to do to run the simplest of simple program's everyone else has asked about where it is and what not. According to them i have everything where it needs to be. You have had a response from me and from Alan Gauld. We have both offered advice and asked questions. We can't do anything more for you until you try our advice and let us know where or how it is not helping, and answer our questions. We realty want to help, and we need your cooperation to help effectively. I like to think i'm reasonable at most computer things or anything to do with them i've built 3 working computers and i'm working on another with a friend and still this stumps me. Skill with hardware has little to do with software skills. Of the 4 or 5 replies i think that you would be most help. We all can help. AND PLEASE as I asked, reply to the list not just me. -- Bob Gailer 919-636-4239 Chapel Hill, NC ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] help with augumented assignment y += 1
Norman Khine wrote:
Hello,
I am writing a poll application, which has two XML files:
Is this entire question consistent? I ask because when you get to
asking your question below, it sounds like you're trying to tie together
two outputs:
snip and paste from below
This returns:
['1'] ['1', '2', '2', '2'] [1, 1, 2, 4]
['0'] ['1', '2', '2'] [2, 2, 3]
...and
This returns:
[{'question': 'a1', 'options': [[u'Yes', u'No', uDon't know]],
'title': uIs an augumented assignment such as 'x=x + 1' the same as x
+= 1?}, {'question': 'a2', 'options': [[u'x=(x * y) + 1', u'x=x
*(y + 1), u'x=(y + 1) * x', u'All of the above']], 'title': uThe
statement 'x *= y + 1' is equivalent to:}]
The second is clearly the survey -- it's the first I question. How do
those two lines relate to the xml response?
If you could coalesce your example into a single executable or clearly
relate those two lines to the xlm response it (presumably) derives from
there's a better chance you'll get a more helpful reply.
Regards,
Emile
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Re: [Tutor] help with augumented assignment y += 1
Norman Khine wrote:
Hi,
Appologies, there was a typo, in that the first line is:
['1'] ['a1', 'a2', 'a2', 'a2'] [1, 1, 2, 4]
Yes -- that helps.
So, working from your xml samples, by doing something like:
responses = [ [a,b,c] for a,b,c in responseAnalysisGenerator ]
you can end up with responses and survey that look like:
responses = [
[['1'],['a1', 'a2'],[1, [2,3]]],
[['5'],['a1', 'a2'],[1, 2]],
[['3'],['a1', 'a2'],[3, 4]]
]
survey = [{'question': 'a1',
'options': [[u'Yes',
u'No',
uDon't know]],
'title': uIs an augumented assignment such as \
'x = x + 1' the same as x += 1?},
{'question': 'a2',
'options': [[u'x = (x * y) + 1',
u'x = x * (y + 1),
u'x = (y + 1) * x',
u'All of the above']],
'title': uThe statement 'x *= y + 1' is equivalent to:}]
Now the questions evolves to extracting the appropriate formatted output
from these two structures. This can take place in many ways and is
directly a function of the range of questions you'd want to answer. In
addition to the totals by question, one of your output formats appeared
to be a restatement by user of the survey. This suggests a class
structure where you initialize the class with something like:
myAnalyzer = SurveyAnalyzer(survey,responses)
and let it respond to queries like:
sampleRecap = myAnalyzer.recap()
sampleRecap = myAnalyzer.userResponse('3')
Does this help?
Emile
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[Tutor] Communication between threads
All, I'm looking for some thoughts on how two separate threads can communicate in Python. From what I've read in a few Python books, sharing data between threads can be done by writing and reading a global variable in the parent of both threads. Is this the best way? Is it the *only* way? Also, any thoughts on how to best use notify()? I've found very little documentation on how to best use notify() when dealing with multiple threads. (many of the documents I've found explain how to use notifyAll(), but I'm unsure broadcasting a message to all threads like that is the best way to deal with a problem) Sorry this question is so broad; threading (properly) seems to be a complex subject and it seems I'm in over my head. I've read tons of documents, however, and am still rather unclear about all the tiny parts of the big picture. Thoughts? :) Thanks! -j ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] understanding join
Hi tutor list, Just trying to add some clarity to the built-in function strings using join. The Python help screen says it returns a string which is a concatenation of strings in sequence. I am concatenating the string I am working on that maybe an issue of its own. Here's my example: string ='ab' so, if I type: print string.join(string) aabb but if string is 'abc' print string.join(string) aabcbabcc print string ='a' returns on a in this example, whit string='a ' returns aa. So, I am not catching the pattern. Thanks. Steve ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Communication between threads
James wrote: All, I'm looking for some thoughts on how two separate threads can communicate in Python. From what I've read in a few Python books, sharing data between threads can be done by writing and reading a global variable in the parent of both threads. Is this the best way? Is it the *only* way? I happened to see an article on this -- let's see... http://www.ibm.com/developerworks/aix/library/au-threadingpython/index.html Specifically the queues discussion. HTH, Emile ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] understanding join
On 31/07/2008, Steve Poe [EMAIL PROTECTED] wrote:
Hi tutor list,
Just trying to add some clarity to the built-in function strings using
join. The Python help
screen says it returns a string which is a concatenation of strings in
sequence. I am concatenating
the string I am working on that maybe an issue of its own.
[...]
but if string is 'abc'
print string.join(string)
aabcbabcc
Hi Steve,
First up, a quick comment: There is a string module in the standard
library, and it has a function called join(). So it's generally a
good idea not to use 'string' as a variable name, as it can confuse
people :-)
Now, to your question: your string is 'abc'. It doesn't matter that
you're using a string to join itself; what you've written is identical
to:
'abc'.join('abc')
'aabcbabcc'
Let's change the call slightly to make things more clear:
'abc'.join('ABC')
'AabcBabcC'
Does that make the pattern more clear?
--
John.
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Re: [Tutor] understanding join
On 31/07/2008, Steve Poe [EMAIL PROTECTED] wrote:
Good point. I guess I am surprised a little that Python does not error
on that you cannot assign a variable to a module name. I know I need
to learn proper coding techniques.
Well, that wouldn't really work because you don't know what other
modules people have.
Okay, I can see the order of the join is the same as mine, but
the join still seems to be out of sequence. I am thinking it should be
'abcABC' or 'ABCabc' not at the beginning, middle, and end of the
original string. At least, I am trying to wrap my head around its
usefulness.
Say I have a sequence seq and a string s, and I call s.join(seq).
Here's what it does:
s.join(seq) == seq[0] + s + seq[1] + s + seq[2] + s + ... + seq[-2] +
s + seq[-1]
So if you call 'abc'.join('ABC'), you get:
'ABC'[0] + 'abc' + 'ABC'[1] + 'abc' + 'ABC'[2]
which is:
'A' + 'abc' + 'B' + 'abc' + 'C'
Hope this helps.
--
John.
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Re: [Tutor] understanding join
On 31/07/2008, Steve Poe [EMAIL PROTECTED] wrote: Okay, I can see the order of the join is the same as mine, but the join still seems to be out of sequence. I am thinking it should be 'abcABC' or 'ABCabc' not at the beginning, middle, and end of the original string. At least, I am trying to wrap my head around its usefulness. Does this look useful? In [3]: people = [ 'Tom', 'Dick', 'Harry' ] In [4]: ', '.join(people) Out[4]: 'Tom, Dick, Harry' Your confusion is in thinking about the string 'ABC' as a single entity. For the purposes of join(), it is a sequence of three letters. The argument to join() is a sequence of strings, not a single string. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] checking for expected types from input file
I am populating a dictionary from an input file, and would like to create an
error code if a string is sent to a variable that expects a float or int.
INPUT = {}
for line in open(infile):
input_line = line.split(' = ')
INPUT[input_line[0].strip()] = input_line[1].strip()
if INPUT.has_key('ReferencePositionX'):
refx = float(INPUT['ReferencePositionX'])/10
refy = float(INPUT['ReferencePositionY'])/10
refz = float(INPUT['ReferencePositionZ'])/10
I have many variables of different types, and I want to do a check in
case something like ReferencePositionX = abc occurs.
--
The game of science can accurately be described as a never-ending insult to
human intelligence. - João Magueijo
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Re: [Tutor] checking for expected types from input file
Bryan,
How about checking your input to see if they are digits or not?
input_data = '123ABC'
print input_data.isdigit()
False
input_data = '1234567889'
print input_data.isdigit()
True
input_data = '123ABC'
print input_data.isdigit()
False
or something like:
while INPUT.has_key('ReferencePositionX').isdigit() =='True':
refx = float(INPUT['ReferencePositionX'])/10
refy = float(INPUT['ReferencePositionY'])/10
refz = float(INPUT['ReferencePositionZ'])/10
Steve
On Jul 30, 2008, at 6:43 PM, Bryan Fodness wrote:
I am populating a dictionary from an input file, and would like to
create an error code if a string is sent to a variable that expects
a float or int.
INPUT = {}
for line in open(infile):
input_line = line.split(' = ')
INPUT[input_line[0].strip()] = input_line[1].strip()
if INPUT.has_key('ReferencePositionX'):
refx = float(INPUT['ReferencePositionX'])/10
refy = float(INPUT['ReferencePositionY'])/10
refz = float(INPUT['ReferencePositionZ'])/10
I have many variables of different types, and I want to do a check
in case something like ReferencePositionX = abc occurs.
--
The game of science can accurately be described as a never-ending
insult to human intelligence. - João Magueijo
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Re: [Tutor] checking for expected types from input file
Bryan Fodness [EMAIL PROTECTED] wrote I have many variables of different types, and I want to do a check in case something like ReferencePositionX = abc occurs. In Python its usual to tackle that using try/except. If you get a TypeError then try type conversion. The saying goes somethinng like: Its better to ask forgivness than permission Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] understanding join
Steve Poe [EMAIL PROTECTED] wrote Your explanation is very help. It does make be wonder the usefulness of join with strings. Do you have a practical example/situation? Its not really intended for strings but it needs to work that way to be consistent because strings are just another type of collection in Python and we want to treat collections (or sequences) as consistently as possible. But there are times when you want to separate the characters of a string out for display and inserting a space or a comma using join is convenient. It would be extremely rare to use mystring.joing(mystring) It is usually myseparator.join(mysequence) HTH -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] key/value order in dictionaries
Hi tutor list,
In dictionaries, I know that the keys are immutable, and the values
can change What about the place/order of the key/order? I thought
that they were sequential and they do not change.
D={AAA:1234,BBB:3456,CCC:7890}
print D
{'AAA': 1234, 'BBB': 3456, 'CCC': 7890}
D={}
D={AAA:1234,BBB:3456,CCC:7890,DDD:,EEE:,FFF:
}
print D
{'AAA': 1234, 'BBB': 3456, 'EEE': , 'FFF': , 'CCC': 7890,
'DDD': }
If I know the key, then I can find the value, so the order it is in
the dictionary
should not matter. I am just curious why this happens. If I have (4)
key/value
pairs, the display order is the same as I entered the them. With 5 or
more key/value
dictionaries, the printed result is not sequential.
Any thoughts?
Steve
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