More list building

[Peter Otten]

louis.a.russ at 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.)