Re: Inplace shuffle function returns none

Hi Chris I read this last night and thought i may have woken with a frightfully witty response. I didnt however. Thanks :-) -- https://mail.python.org/mailman/listinfo/python-list

Re: Inplace shuffle function returns none

On Wed, Oct 19, 2016 at 6:01 PM, Sayth Renshaw wrote: > Ok i think i do understand it. I searched the python document for in-place > functions but couldn't find a specific reference. > > Is there a particular part in docs or blog that covers it? Or is it > fundamental to

Re: Inplace shuffle function returns none

Sayth Renshaw writes: > Ok i think i do understand it. I searched the python document for > in-place functions but couldn't find a specific reference. They aren't a separate kind of function. A function can do anything Python code can do; indeed, most Python programs

Re: Inplace shuffle function returns none

Steve D'Aprano wrote: > On Wed, 19 Oct 2016 07:25 am, Sayth Renshaw wrote: > >> So why can't i assign the result slice to a variable b? >> >> It just keeps getting none. > > Of course you can assign the result slice to b. You just have to do it the > right way. > > You keep getting None

Re: Inplace shuffle function returns none

Ok i think i do understand it. I searched the python document for in-place functions but couldn't find a specific reference. Is there a particular part in docs or blog that covers it? Or is it fundamental to all so not explicitly treated in one particular page? Thanks Sayth --

Re: Inplace shuffle function returns none

On Wed, 19 Oct 2016 07:25 am, Sayth Renshaw wrote: > So why can't i assign the result slice to a variable b? > > It just keeps getting none. Of course you can assign the result slice to b. You just have to do it the right way. You keep getting None because you do it the wrong way.

Re: Inplace shuffle function returns none

In <9d24f23c-b578-4029-ab80-f117599e2...@googlegroups.com> Sayth Renshaw writes: > So why can't i assign the result slice to a variable b? Because shuffle() modifies the list directly, and returns None. It does NOT return the shuffled list. -- John Gordon

Re: Inplace shuffle function returns none

On Tuesday, October 18, 2016 at 9:25:19 PM UTC+1, Sayth Renshaw wrote: > So why can't i assign the result slice to a variable b? > > It just keeps getting none. > > Sayth You are misunderstanding something that is fundamental in Python, namely that anything that is done inplace *ALWAYS*

Re: Inplace shuffle function returns none

On Tue, Oct 18, 2016 at 2:25 PM, Sayth Renshaw wrote: > So why can't i assign the result slice to a variable b? > > It just keeps getting none. Because shuffle returns none. If you want to keep both the original list and the shuffled list, then do something like: b =

Re: Inplace shuffle function returns none

So why can't i assign the result slice to a variable b? It just keeps getting none. Sayth -- https://mail.python.org/mailman/listinfo/python-list

Re: Inplace shuffle function returns none

In Sayth Renshaw writes: > If shuffle is an "in place" function and returns none how do i obtain > the values from it. The values are still in the original object -- variable "a" in your example. > from random

Re: Inplace shuffle function returns none

On Wed, Oct 19, 2016 at 1:48 AM, Sayth Renshaw wrote: > If shuffle is an "in place" function and returns none how do i obtain the > values from it. > > from random import shuffle > > a = [1,2,3,4,5] > b = shuffle(a) > print(b[:3]) > > For example here i just want to slice

Inplace shuffle function returns none

If shuffle is an "in place" function and returns none how do i obtain the values from it. from random import shuffle a = [1,2,3,4,5] b = shuffle(a) print(b[:3]) For example here i just want to slice the first 3 numbers which should be shuffled. However you can't slice a noneType object that b