Re: [Newbie] List from a generator function

[Sion Arrowsmith]

Paul Rubin  http://[EMAIL PROTECTED] wrote:
 print list(islice(starmap(random.choice, repeat((possible_notes,))), length))

Why the use of starmap() rather than
imap(random.choice, repeat(possible_notes))
?

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Re: [Newbie] List from a generator function

[Paul Rubin]

Sion Arrowsmith [EMAIL PROTECTED] writes:
 Why the use of starmap() rather than
 imap(random.choice, repeat(possible_notes))
 ?

Hmm, not sure what I was thinking.  I remember imap... no that won't
work... ok, starmap.  It was late.  It's late now.
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[Newbie] List from a generator function

[Ernesto García García]

Hi all,

I'm sure there is a better way to do this:

[random.choice(possible_notes) for x in range(length)]

Regards,
Ernesto
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Re: [Newbie] List from a generator function

[Marc 'BlackJack' Rintsch]

In [EMAIL PROTECTED], Ernesto García García wrote:

 I'm sure there is a better way to do this:
 
 [random.choice(possible_notes) for x in range(length)]

There is at least a better way to ask the question.  The subject has
nothing to do with the body of your post.  Or am I missing something?

What is `length`?  Do you want unique elements from `possible_notes`? 
Then you could use `random.sample()`.

Ciao,
Marc 'BlackJack' Rintsch
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Re: [Newbie] List from a generator function

[Ernesto García García]

I'm sure there is a better way to do this:

[random.choice(possible_notes) for x in range(length)]

 There is at least a better way to ask the question.  The subject has
 nothing to do with the body of your post.  Or am I missing something?

Sorry, I should have explained better. I just want to build a fix length 
list made up of elements generated by a function, in this case 
random.choice(). I don't like my list comprehension, because I'm using 
that dumb variable x and the range() list.

Ernesto
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Re: [Newbie] List from a generator function

[Paul Rubin]

Ernesto García García [EMAIL PROTECTED] writes:
 [random.choice(possible_notes) for x in range(length)]
 
  There is at least a better way to ask the question.  The subject has
  nothing to do with the body of your post.  Or am I missing something?
 
 Sorry, I should have explained better. I just want to build a fix
 length list made up of elements generated by a function, in this case
 random.choice(). I don't like my list comprehension, because I'm using
 that dumb variable x and the range() list.

Use xrange instead of range.  If you want to do it with no variables,
hmmm:

  from itertools import islice, starmap, repeat
  import random

  possible_notes = range(12)
  length = 9

  print list(islice(starmap(random.choice, repeat((possible_notes,))), length))


 ## working on region in file /usr/tmp/python-21885hGZ...
[10, 0, 6, 7, 8, 1, 9, 6, 11]

Maybe you're sorry you asked ;)
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Re: [Newbie] List from a generator function

[Peter Otten]

Ernesto García García wrote:

 I'm sure there is a better way to do this:
 
 [random.choice(possible_notes) for x in range(length)]

Note that generator has a fixed meaning in Python:
http://www.python.org/dev/peps/pep-0255/

For generators you can use

list(itertools.islice(gen()), length)

What you need then would be a way to turn an ordinary function into a
generator:

 def make_gen(fun, *args, **kw):
... def gen():
... while 1:
... yield fun(*args, **kw)
... return gen()
...
 from random import choice
 from itertools import islice
 length = 7
 sample = abcde
 list(islice(make_gen(choice, sample), length))
['e', 'b', 'b', 'a', 'b', 'b', 'a']

Peter
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Re: [Newbie] List from a generator function

[Ernesto García García]

Thank you guys.

So the answer is to keep with the original form, perhaps with xrange.

Ernesto
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