Re: [Tutor] BMI calc
>> Yes, you are right, of course.
>> Thanks for reminding me that we are dealing with floats.
>> I should have used approximations, with an (epsilon) error range.
>> I will remember if future, I hope.
>
> The solution I had in mind is simpler:
>
> if bmi < 18.5:
> print "underweight"
> elif bmi < 25:
> print "normal"
> elif bmi < 30:
> print "overweight"
> else:
> print "obese"
How about this approach? the "if" statements are simpler=better, but this is
fun too!
import bisect
def getBMI(height, weight, cutoffs=[18, 25, 30],
categories=('under', 'normal', 'obese', 'morbidly')):
bmi = weight / float(height ** 2)
return categories[bisect.bisect(cutoffs, bmi)]
cutoffs=[18, 25, 30]
categories =('skinny', 'normal', 'teddybear', 'huge teddybear')
print getBMI(1.82, 180, cutoffs, categories)___
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Re: [Tutor] BMI calc
Shall, Sydney wrote: > On 13/03/2013 12:21, Peter Otten wrote: >> Shall, Sydney wrote: >> >>> I am also a newbie, but I wish to learn, so I offer the following >>> corrections. >>> # Note. I do note know what units you are using. >>> # I would use scientific, metric units. So you need to divide both >>> weight and height by a suitable conversion factors. >>> # Then you will not need the number 703.0, and the units in the second >>> and third lines would be Kg/m. [Kilogram/Metre) >>> >>> def calc_BMI(weight,height): >>> bmi = (weight/(height*height))*703.0 >>> print 'Your BMI is : ', BMI 'weight units/height units.' # You >>> need >> to put the correct text here. >>> if bmi <=18.5: >>> print 'underweight' >>> if 18.5 <= bmi <= 24.9: >>> print 'normal weight' >>> if 25.0 <= bmi <= 29.9: >>> print 'overweight' >>> if bmi >= 30: >>> print 'obese' >>> return >> A problem that I have not seen addressed yet: >> >> What will this print for the guy who is 75.0 in high and weighs 200.0 lb? >> >> His bmi is >> > height = 75.0 > weight = 200.0 > weight/(height*height)*703.0 >> 24.995 >> >> That's neither normal nor overweight, according to your categorisation. > Yes, you are right, of course. > Thanks for reminding me that we are dealing with floats. > I should have used approximations, with an (epsilon) error range. > I will remember if future, I hope. The solution I had in mind is simpler: if bmi < 18.5: print "underweight" elif bmi < 25: print "normal" elif bmi < 30: print "overweight" else: print "obese" These give you effectively half-open intervals 18.5 <= bmi < 25 # normal 25 <= bmi < 30 # overweight but each test relies on the result of the previous ones. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 13/03/2013 12:21, Peter Otten wrote: Shall, Sydney wrote: I am also a newbie, but I wish to learn, so I offer the following corrections. # Note. I do note know what units you are using. # I would use scientific, metric units. So you need to divide both weight and height by a suitable conversion factors. # Then you will not need the number 703.0, and the units in the second and third lines would be Kg/m. [Kilogram/Metre) def calc_BMI(weight,height): bmi = (weight/(height*height))*703.0 print 'Your BMI is : ', BMI 'weight units/height units.' # You need to put the correct text here. if bmi <=18.5: print 'underweight' if 18.5 <= bmi <= 24.9: print 'normal weight' if 25.0 <= bmi <= 29.9: print 'overweight' if bmi >= 30: print 'obese' return A problem that I have not seen addressed yet: What will this print for the guy who is 75.0 in high and weighs 200.0 lb? His bmi is height = 75.0 weight = 200.0 weight/(height*height)*703.0 24.995 That's neither normal nor overweight, according to your categorisation. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Yes, you are right, of course. Thanks for reminding me that we are dealing with floats. I should have used approximations, with an (epsilon) error range. I will remember if future, I hope. Sydney -- Professor Sydney Shall, Department of Haematological Medicine, King's College London, Medical School, 123 Coldharbour Lane, LONDON SE5 9NU, Tel & Fax: +44 (0)207 848 5902, E-Mail: sydney.shall, [correspondents outside the College should add; @kcl.ac.uk] www.kcl.ac.uk ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
Shall, Sydney wrote: > I am also a newbie, but I wish to learn, so I offer the following > corrections. > # Note. I do note know what units you are using. > # I would use scientific, metric units. So you need to divide both > weight and height by a suitable conversion factors. > # Then you will not need the number 703.0, and the units in the second > and third lines would be Kg/m. [Kilogram/Metre) > > def calc_BMI(weight,height): > bmi = (weight/(height*height))*703.0 > print 'Your BMI is : ', BMI 'weight units/height units.' # You need to put the correct text here. > if bmi <=18.5: > print 'underweight' > if 18.5 <= bmi <= 24.9: > print 'normal weight' > if 25.0 <= bmi <= 29.9: > print 'overweight' > if bmi >= 30: > print 'obese' > return A problem that I have not seen addressed yet: What will this print for the guy who is 75.0 in high and weighs 200.0 lb? His bmi is >>> height = 75.0 >>> weight = 200.0 >>> weight/(height*height)*703.0 24.995 That's neither normal nor overweight, according to your categorisation. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
Assuming the BMI formula is correct, the following is how I would have done it
in Python 3. You can safely ignore the comments. If you want to run it, copy
and paste the code into a text editor (you can delete the #comments), save it
with a .py extension (e.g. bmi.py) and run it from within a terminal screen by
typing at the shell prompt python3 bmi.py (in Windows command line you may not
need the 3, I am not sure). If you need further conversions (e.g. converting
height from ft-in to in or from ft-in to cms and so on) you can add a few more
lines of code to do that.
def main():
#it is good practice to modularize your program. Hence, this starts with a
main() function. Defined here and called in the last line.
w=float(input('Please enter your weight in pounds: '))#You need to
capture weight and height. input() built-in function is used to get the value
that will be referenced by the w variable.h=float(input('Please enter your
height in inches: ')) # Since input() always returns string type,
float() -another built in function- is used to convert it to a real number.
calc_BMI(w,h)
#Here you call the BMI calculation function you wrote. Note that you are
passing w and h values into this function.
def calc_BMI(weight,height):
#w and h will be assigned to weight and height -in that order- as parameter
values.bmi=(weight/(height*height))*703.0
#actual calculation. the result is referenced by the bmi variable.if
bmi<18.5:
#removed the equal sign here. In your version 18.5 would have fallen into two
categories.print('underweight')elif bmi>= 18.5 and bmi <=24.9:
print('normal weight')elif bmi >=25 and bmi <=29.9:
print('overweight')else:print('obese')
main()
Haven't tried but it should work.
Altay Aksulu.
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Date: Wed, 13 Mar 2013 11:44:10 +0100
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--Forwarded Message Attachment--
From: ysoli...@uncc.edu
To: breamore...@yahoo.co.uk; tutor@python.org
Date: Wed, 13 Mar 2013 03:07:27 +
Subject: Re: [Tutor] BMI calc
I'm using python 2.7, where exactly does the return statment with the (return
(weight/(height*height))*703 calculation get posted in the function?
def calc_BMI(weight,height):
if bmi <=18.5:
return 'underweight'
elif bmi >= 18.5 and bmi <=24.9:
return 'normal weight'
elif bmi >=25 and bmi <=29.9:
return 'overweight'
elif bmi >=30:
return 'obese'
The user will need to input height ex) 5'3 and which will need to be split and
stripped in order to convert to inches.
From: Tutor [tutor-bounces+ysoliman=uncc@python.org] on behalf of Mark
Lawrence [breamore...@yahoo.co.uk]
Sent: Tuesday, March 12, 2013 10:29 PM
To: tutor@python.org
Subject: Re: [Tutor] BMI calc
On 13/03/2013 02:08, Dave Angel wrote:
> On 03/12/2013 09:46 PM, Mark Lawrence wrote:
>> On 13/03/2013 00:05, Soliman, Yasmin wrote:
>>> Hello all,
>>>
>>> I'm new to python and its been a stuggle so far. I'm attempting to
>>> create a BMI calculator in Wing 101 4.1. I keep getting syntax errors:
>>>
>>> def calc_BMI(weight,height):
>>> return (weight/(height*height))*703.0
>>> if bmi <=18.5:
>>> print 'underweight'
>>> elif bmi >= 18.5 and bmi <=24.9:
>>> print 'normal weight'
>>> elif bmi >=25 and bmi <=29.9:
>>> print 'overweight'
>>> elif bmi >=30:
>>> print 'obese'
>>>
>>> Also, height should be converted to inches and I have not the
>>> slightest clue how to so. Any help would be much appreciated.
>>> _
>>>
>>
>> If you're using Python 3 you'll get syntax errors as print is a
>> function, not a stateme
[Tutor] BMI calc
On 13/03/2013 00:05, Soliman, Yasmin wrote: Hello all, I'm new to python and its been a stuggle so far. I'm attempting to create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: def calc_BMI(weight,height): return (weight/(height*height))*703.0 if bmi <=18.5: print 'underweight' elif bmi >= 18.5 and bmi <=24.9: print 'normal weight' elif bmi >=25 and bmi <=29.9: print 'overweight' elif bmi >=30: print 'obese' Also, height should be converted to inches and I have not the slightest clue how to so. Any help would be much appreciated. ___ Tutor maillist -Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Hi, I am also a newbie, but I wish to learn, so I offer the following corrections. Yes, as someone pointed out, it would be better if several of the print statements were return, as corrected below. # Note. I do note know what units you are using. # I would use scientific, metric units. So you need to divide both weight and height by a suitable conversion factors. # Then you will not need the number 703.0, and the units in the second and third lines would be Kg/m. [Kilogram/Metre) def calc_BMI(weight,height): bmi = (weight/(height*height))*703.0 print 'Your BMI is : ', BMI 'weight units/height units.' # You need to put the correct text here. if bmi <=18.5: return ' You are underweight.' if 18.5 <= bmi <= 24.9: return 'Your weight is in the normal range.' if 25.0 <= bmi <= 29.9: return 'You are overweight.' if bmi >= 30: return 'You are, I regret, obese.' I hope that I am halfway correct. With best wishes, Sydney -- Professor Sydney Shall, Department of Haematological Medicine, King's College London, Medical School, 123 Coldharbour Lane, LONDON SE5 9NU, Tel & Fax: +44 (0)207 848 5902, E-Mail: sydney.shall, [correspondents outside the College should add; @kcl.ac.uk] www.kcl.ac.uk ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 13/03/2013 00:05, Soliman, Yasmin wrote: Hello all, I'm new to python and its been a stuggle so far. I'm attempting to create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: def calc_BMI(weight,height): return (weight/(height*height))*703.0 if bmi <=18.5: print 'underweight' elif bmi >= 18.5 and bmi <=24.9: print 'normal weight' elif bmi >=25 and bmi <=29.9: print 'overweight' elif bmi >=30: print 'obese' Also, height should be converted to inches and I have not the slightest clue how to so. Any help would be much appreciated. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor Hi, I am also a newbie, but I wish to learn, so I offer the following corrections. # Note. I do note know what units you are using. # I would use scientific, metric units. So you need to divide both weight and height by a suitable conversion factors. # Then you will not need the number 703.0, and the units in the second and third lines would be Kg/m. [Kilogram/Metre) def calc_BMI(weight,height): bmi = (weight/(height*height))*703.0 print 'Your BMI is : ', BMI 'weight units/height units.' # You need to put the correct text here. if bmi <=18.5: print 'underweight' if 18.5 <= bmi <= 24.9: print 'normal weight' if 25.0 <= bmi <= 29.9: print 'overweight' if bmi >= 30: print 'obese' return I hope that I am halfway correct. With best wishes, Sydney -- Professor Sydney Shall, Department of Haematological Medicine, King's College London, Medical School, 123 Coldharbour Lane, LONDON SE5 9NU, Tel & Fax: +44 (0)207 848 5902, E-Mail: sydney.shall, [correspondents outside the College should add; @kcl.ac.uk] www.kcl.ac.uk ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 13/03/13 03:07, Soliman, Yasmin wrote: I'm using python 2.7, Then let us see the syntax errors because otherwise we are guessing. > where exactly does the return statment ... get posted in the function? I'm not sure what you mean by 'get posted' It is activated once the function is called. ie def foo(x): return 2 + x does nothing until I call it: result = foo(5) print result def calc_BMI(weight,height): if bmi <=18.5: return 'underweight' Since BMI is a value your function is better as it was, just returning the value. The code to convert that BMI value into a weight assessment is better done outside, again as you had before. (Or inside another function, rateBMI(bmi) maybe) What was missing was some glue that joins those 2 things together: read weight and height call CalcBMI use result to assess weight. elif bmi >= 18.5 and bmi <=24.9: return 'normal weight' BTW in Python you can abbreviate the tests slightly with elif 18.5 <= bmi <= 24.9: print 'normal weight' HTH -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 03/13/2013 02:17 AM, Jos Kerc wrote: Hi, On Wed, Mar 13, 2013 at 4:07 AM, Soliman, Yasmin wrote: def calc_BMI(weight,height): if bmi <=18.5: return 'underweight' elif bmi >= 18.5 and bmi <=24.9: return 'normal weight' elif bmi >=25 and bmi <=29.9: Following return is out of alignment. Should be at the same place in the line as the oters. return 'overweight' It would certainly look prettier, but it's not a language requirement. Only within a single block do the columns have to line up exactly. > -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
Hi, On Wed, Mar 13, 2013 at 4:07 AM, Soliman, Yasmin wrote: > I'm using python 2.7, where exactly does the return statment with the > (return (weight/(height*height))*703 calculation get posted in the function? > > def calc_BMI(weight,height): > if bmi <=18.5: > return 'underweight' > elif bmi >= 18.5 and bmi <=24.9: > return 'normal weight' > elif bmi >=25 and bmi <=29.9: > Following return is out of alignment. Should be at the same place in the line as the oters. > return 'overweight' > elif bmi >=30: > return 'obese' > > The user will need to input height ex) 5'3 and which will need to be split > and stripped in order to convert to inches. > Exactly. Do you have a problem with this? If so what? Dreetz ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
I'm using python 2.7, where exactly does the return statment with the (return (weight/(height*height))*703 calculation get posted in the function? def calc_BMI(weight,height): if bmi <=18.5: return 'underweight' elif bmi >= 18.5 and bmi <=24.9: return 'normal weight' elif bmi >=25 and bmi <=29.9: return 'overweight' elif bmi >=30: return 'obese' The user will need to input height ex) 5'3 and which will need to be split and stripped in order to convert to inches. From: Tutor [tutor-bounces+ysoliman=uncc@python.org] on behalf of Mark Lawrence [breamore...@yahoo.co.uk] Sent: Tuesday, March 12, 2013 10:29 PM To: tutor@python.org Subject: Re: [Tutor] BMI calc On 13/03/2013 02:08, Dave Angel wrote: > On 03/12/2013 09:46 PM, Mark Lawrence wrote: >> On 13/03/2013 00:05, Soliman, Yasmin wrote: >>> Hello all, >>> >>> I'm new to python and its been a stuggle so far. I'm attempting to >>> create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: >>> >>> def calc_BMI(weight,height): >>> return (weight/(height*height))*703.0 >>> if bmi <=18.5: >>> print 'underweight' >>> elif bmi >= 18.5 and bmi <=24.9: >>> print 'normal weight' >>> elif bmi >=25 and bmi <=29.9: >>> print 'overweight' >>> elif bmi >=30: >>> print 'obese' >>> >>> Also, height should be converted to inches and I have not the >>> slightest clue how to so. Any help would be much appreciated. >>> _ >>> >> >> If you're using Python 3 you'll get syntax errors as print is a >> function, not a statement as in Python 2. Is this your problem? If not >> please cut and paste the exact syntax error for us to see. Then we'll >> sort the rest of the problems :) >> > > As Mark implies, tell us exactly what Python version you're using, and > copy/paste the entire error message, including traceback. > > For example, when I run it on 3.3, I have: > > davea@think2:~/temppython$ python3.3 soliman.py >File "soliman.py", line 6 > print 'underweight' >^ > SyntaxError: invalid syntax > > > Also, could you tell us your experience level? You've defined a > function, but you haven't called it. And yet you're apparently trying > to use the results of calling it. > > As for converting height to inches, that depends on what you started > with. Since you're using the English version of the formula, you should > already have inches and pounds before calling that function. > > So perhaps in addition to missing the code for inputting the values > (perhaps the raw_input function), you're also missing the conversion > from "something" to inches. How are you getting the raw numbers, and > what units are they in? > > If the raw numbers are in meters and kg, then you'd want to remove the > multiply by 703. Or you could convert from meters to inches by > multiplying by 39.? (look up the exact number). And from kg to pounds > by a similar multiply by something like 2.2 > Of course if you've got the wrong algorithm you're wasting your time anyway, see for example http://www.newscientist.com/article/mg20928030.200-obesity-expert-a-better-fat-measure-than-bmi.html :) -- Cheers. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 13/03/2013 02:08, Dave Angel wrote: On 03/12/2013 09:46 PM, Mark Lawrence wrote: On 13/03/2013 00:05, Soliman, Yasmin wrote: Hello all, I'm new to python and its been a stuggle so far. I'm attempting to create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: def calc_BMI(weight,height): return (weight/(height*height))*703.0 if bmi <=18.5: print 'underweight' elif bmi >= 18.5 and bmi <=24.9: print 'normal weight' elif bmi >=25 and bmi <=29.9: print 'overweight' elif bmi >=30: print 'obese' Also, height should be converted to inches and I have not the slightest clue how to so. Any help would be much appreciated. _ If you're using Python 3 you'll get syntax errors as print is a function, not a statement as in Python 2. Is this your problem? If not please cut and paste the exact syntax error for us to see. Then we'll sort the rest of the problems :) As Mark implies, tell us exactly what Python version you're using, and copy/paste the entire error message, including traceback. For example, when I run it on 3.3, I have: davea@think2:~/temppython$ python3.3 soliman.py File "soliman.py", line 6 print 'underweight' ^ SyntaxError: invalid syntax Also, could you tell us your experience level? You've defined a function, but you haven't called it. And yet you're apparently trying to use the results of calling it. As for converting height to inches, that depends on what you started with. Since you're using the English version of the formula, you should already have inches and pounds before calling that function. So perhaps in addition to missing the code for inputting the values (perhaps the raw_input function), you're also missing the conversion from "something" to inches. How are you getting the raw numbers, and what units are they in? If the raw numbers are in meters and kg, then you'd want to remove the multiply by 703. Or you could convert from meters to inches by multiplying by 39.? (look up the exact number). And from kg to pounds by a similar multiply by something like 2.2 Of course if you've got the wrong algorithm you're wasting your time anyway, see for example http://www.newscientist.com/article/mg20928030.200-obesity-expert-a-better-fat-measure-than-bmi.html :) -- Cheers. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 03/12/2013 09:46 PM, Mark Lawrence wrote: On 13/03/2013 00:05, Soliman, Yasmin wrote: Hello all, I'm new to python and its been a stuggle so far. I'm attempting to create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: def calc_BMI(weight,height): return (weight/(height*height))*703.0 if bmi <=18.5: print 'underweight' elif bmi >= 18.5 and bmi <=24.9: print 'normal weight' elif bmi >=25 and bmi <=29.9: print 'overweight' elif bmi >=30: print 'obese' Also, height should be converted to inches and I have not the slightest clue how to so. Any help would be much appreciated. _ If you're using Python 3 you'll get syntax errors as print is a function, not a statement as in Python 2. Is this your problem? If not please cut and paste the exact syntax error for us to see. Then we'll sort the rest of the problems :) As Mark implies, tell us exactly what Python version you're using, and copy/paste the entire error message, including traceback. For example, when I run it on 3.3, I have: davea@think2:~/temppython$ python3.3 soliman.py File "soliman.py", line 6 print 'underweight' ^ SyntaxError: invalid syntax Also, could you tell us your experience level? You've defined a function, but you haven't called it. And yet you're apparently trying to use the results of calling it. As for converting height to inches, that depends on what you started with. Since you're using the English version of the formula, you should already have inches and pounds before calling that function. So perhaps in addition to missing the code for inputting the values (perhaps the raw_input function), you're also missing the conversion from "something" to inches. How are you getting the raw numbers, and what units are they in? If the raw numbers are in meters and kg, then you'd want to remove the multiply by 703. Or you could convert from meters to inches by multiplying by 39.? (look up the exact number). And from kg to pounds by a similar multiply by something like 2.2 -- DaveA ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] BMI calc
On 13/03/2013 00:05, Soliman, Yasmin wrote: Hello all, I'm new to python and its been a stuggle so far. I'm attempting to create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: def calc_BMI(weight,height): return (weight/(height*height))*703.0 if bmi <=18.5: print 'underweight' elif bmi >= 18.5 and bmi <=24.9: print 'normal weight' elif bmi >=25 and bmi <=29.9: print 'overweight' elif bmi >=30: print 'obese' Also, height should be converted to inches and I have not the slightest clue how to so. Any help would be much appreciated. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor If you're using Python 3 you'll get syntax errors as print is a function, not a statement as in Python 2. Is this your problem? If not please cut and paste the exact syntax error for us to see. Then we'll sort the rest of the problems :) -- Cheers. Mark Lawrence ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] BMI calc
Hello all, I'm new to python and its been a stuggle so far. I'm attempting to create a BMI calculator in Wing 101 4.1. I keep getting syntax errors: def calc_BMI(weight,height): return (weight/(height*height))*703.0 if bmi <=18.5: print 'underweight' elif bmi >= 18.5 and bmi <=24.9: print 'normal weight' elif bmi >=25 and bmi <=29.9: print 'overweight' elif bmi >=30: print 'obese' Also, height should be converted to inches and I have not the slightest clue how to so. Any help would be much appreciated. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
