[Edu-sig] Hello from a CS Teacher

[Steve Litt]

At 04:59 PM 02/11/2000 -0800, Kirby Urner wrote:

Kirby -- your program worked nicely on my Red Hat box. I'd like to try
writing a program that outputs music through the computer case's built in
speaker. Does anyone know of a python command to output a frequency to the
built in speaker, or do you know an OS call to do it?

Thanks

Steve

Steve Litt
Webmaster, Troubleshooters.Com
http://www.troubleshooters.com
slitt@troubleshooters.com


>MODULE:  seive.py
>
>primes = [2]    # dynamic list of primes
>
>def get2nb(nbprimes):
>   # return list of primes
>   # nbprimes = number of primes to list
>
>   global primes  # keep at module level for re-use
>
>   # chop the list if already longer than we need
>   if len(primes)>nbprimes: primes = primes[:nbprimes]
>
>   # start with highest prime so far
>   i = primes[-1]
>
>   while len(primes)<nbprimes:
>       if addprime(i): primes.append(i)
>       # skip even numbers (only 2 is prime)
>       if i==2: i=i+1
>       else:    i=i+1
>
>   return primes
>
>def addprime(n):
>   # internal seive to check whether a number is prime
>
>   verdict = 1   # default is "yes, add to list"
>
>   for i in primes:
>        if (i==n) | (n%i == 0): # is prime or no remainder
>           verdict = 0          # so we _don't_ want to add
>           break
>        if i**2 > n:            # stop trying to divide by
>           break                # lower primes when p**2 > n
>
>   return verdict
>
>In action:
>
>>>> reload(seive)
><module 'seive' from 'G:\Python\seive.py'>
>>>> seive.get2nb(10)
>[2, 3, 5, 7, 11, 13, 17, 19, 23, 29]
>>>> seive.get2nb(5)
>[2, 3, 5, 7, 11]
>>>> seive.get2nb(30)
>[2, 3, 5, 7, 11, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 
>53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109]
>
>
>
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