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More list building

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  More list building DFS <nospam@dfs.com> - 2016-05-11 13:21 -0400
    Re: More list building louis.a.russ@gmail.com - 2016-05-11 19:51 -0700
      Re: More list building Peter Otten <__peter__@web.de> - 2016-05-12 11:08 +0200
        Re: More list building DFS <nospam@dfs.com> - 2016-05-12 12:35 -0400
      Re: More list building DFS <nospam@dfs.com> - 2016-05-12 07:36 -0400
    Re: More list building marco.nawijn@colosso.nl - 2016-05-12 01:21 -0700
      Re: More list building DFS <nospam@dfs.com> - 2016-05-12 08:05 -0400

#108526 — More list building

Have:
p1 = ['Now', 'the', 'for', 'good']
p2 = ['is', 'time', 'all', 'men']

want
[('Now','is','the','time'), ('for','all','good','men')]

This works:

p = []
for i in xrange(0,len(p1),2):
	p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))


But it seems clunky.

Better way(s)?

Thanks

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#108539

On Wednesday, May 11, 2016 at 1:22:09 PM UTC-4, DFS wrote:
> Have:
> p1 = ['Now', 'the', 'for', 'good']
> p2 = ['is', 'time', 'all', 'men']
> 
> want
> [('Now','is','the','time'), ('for','all','good','men')]
> 
> This works:
> 
> p = []
> for i in xrange(0,len(p1),2):
> 	p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))
> 
> 
> But it seems clunky.
> 
> Better way(s)?
> 
> Thanks

Would this work for you? Or do you need something more general?
t = list(zip(p1,p2))
p = [t[0]+t[1],t[2]+t[3]]

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#108548

louis.a.russ@gmail.com wrote:

> On Wednesday, May 11, 2016 at 1:22:09 PM UTC-4, DFS wrote:
>> Have:
>> p1 = ['Now', 'the', 'for', 'good']
>> p2 = ['is', 'time', 'all', 'men']
>> 
>> want
>> [('Now','is','the','time'), ('for','all','good','men')]
>> 
>> This works:
>> 
>> p = []
>> for i in xrange(0,len(p1),2):
>> p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))
>> 
>> 
>> But it seems clunky.
>> 
>> Better way(s)?
>> 
>> Thanks
> 
> Would this work for you? Or do you need something more general?
> t = list(zip(p1,p2))
> p = [t[0]+t[1],t[2]+t[3]]

This can be generalized as

>>> t = iter(zip(p1, p2))
>>> [a + b for a, b in zip(t, t)]
[('Now', 'is', 'the', 'time'), ('for', 'all', 'good', 'men')]

(The iter() call can be omitted in Python 3.)

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#108565

On 5/12/2016 5:08 AM, Peter Otten wrote:
>
>> On Wednesday, May 11, 2016 at 1:22:09 PM UTC-4, DFS wrote:

>>> p = []
>>> for i in xrange(0,len(p1),2):
>>> p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))

xrangeMethod


>>>> t = iter(zip(p1, p2))
>>>> p = [a + b for a, b in zip(t, t)]

iterMethod



Finished 100 loops of xrange in 0.0727 seconds
Finished 100 loops of iter   in 0.0495 seconds

Finished 1000 loops of xrange in 0.730 seconds
Finished 1000 loops of iter   in 0.487 seconds

Finished 10000 loops of xrange in 7.27 seconds
Finished 10000 loops of iter   in 4.79 seconds


(using Windows time.clock())





========================================================================
data scraped from
https://www.enthought.com/products/canopy/package-index/

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#108552

On 5/11/2016 10:51 PM, louis.a.russ@gmail.com wrote:
> On Wednesday, May 11, 2016 at 1:22:09 PM UTC-4, DFS wrote:
>> Have:
>> p1 = ['Now', 'the', 'for', 'good']
>> p2 = ['is', 'time', 'all', 'men']
>>
>> want
>> [('Now','is','the','time'), ('for','all','good','men')]
>>
>> This works:
>>
>> p = []
>> for i in xrange(0,len(p1),2):
>> 	p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))
>>
>>
>> But it seems clunky.
>>
>> Better way(s)?
>>
>> Thanks
>
> Would this work for you? Or do you need something more general?
> t = list(zip(p1,p2))
> p = [t[0]+t[1],t[2]+t[3]]


Something more general, to handle all list sizes (where size % 2 = 0).

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#108545

On Wednesday, May 11, 2016 at 7:22:09 PM UTC+2, DFS wrote:
> Have:
> p1 = ['Now', 'the', 'for', 'good']
> p2 = ['is', 'time', 'all', 'men']
> 
> want
> [('Now','is','the','time'), ('for','all','good','men')]
> 
> This works:
> 
> p = []
> for i in xrange(0,len(p1),2):
> 	p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))
> 
> 
> But it seems clunky.
> 
> Better way(s)?
> 
> Thanks

Another way using some array manipulation:
(using Python 2.7 and numpy)

# coding: utf-8
import numpy as np

p1 = np.array(('Now', 'the', 'for', 'good'))
p2 = np.array(('is', 'time', 'all', 'men'))

p1s = np.split(p1, 2)
p2s = np.split(p2, 2)

a1 = np.vstack((p1, p2))

r1 = np.hstack((a1[:, 0], a1[:, 1]))
r2 = np.hstack((a1[:, 2], a1[:, 3]))

print r1
print r2

Produces the following output:
['Now' 'is' 'the' 'time']
['for' 'all' 'good' 'men']

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#108553

On 5/12/2016 4:21 AM, marco.nawijn@colosso.nl wrote:
> On Wednesday, May 11, 2016 at 7:22:09 PM UTC+2, DFS wrote:
>> Have:
>> p1 = ['Now', 'the', 'for', 'good']
>> p2 = ['is', 'time', 'all', 'men']
>>
>> want
>> [('Now','is','the','time'), ('for','all','good','men')]
>>
>> This works:
>>
>> p = []
>> for i in xrange(0,len(p1),2):
>> 	p.insert(i,(p1[i],p2[i],p1[i+1],p2[i+1]))
>>
>>
>> But it seems clunky.
>>
>> Better way(s)?
>>
>> Thanks
>
> Another way using some array manipulation:
> (using Python 2.7 and numpy)
>
> # coding: utf-8
> import numpy as np
>
> p1 = np.array(('Now', 'the', 'for', 'good'))
> p2 = np.array(('is', 'time', 'all', 'men'))


> p1s = np.split(p1, 2)
> p2s = np.split(p2, 2)

These 2 lines aren't necessary.  Were you just trying some things and 
left them in?


> a1 = np.vstack((p1, p2))
>
> r1 = np.hstack((a1[:, 0], a1[:, 1]))
> r2 = np.hstack((a1[:, 2], a1[:, 3]))
>
> print r1
> print r2
>
> Produces the following output:
> ['Now' 'is' 'the' 'time']
> ['for' 'all' 'good' 'men']


Thanks.

How would you generalize it for all size lists (where size % 2 = 0)?

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