Making a dict from two lists/tuples

[Duncan Booth]

Jonas Meyer Rasmussen <meyer at diku.dk> wrote in 
news:Pine.LNX.4.21.0105241705001.27131-100000 at berling.diku.dk:

> On Thu, 24 May 2001, Duncan Booth wrote:
> 
>> "Jonas Meyer Rasmussen" <meyer at kampsax.dtu.dk> wrote in 
>> news:9eiljf$jg1$1 at eising.k-net.dk:
>> 
>> > for key,value in keys,values
>> >     dict[key] = value
>> 
>> Bzzzt! Wrong answer.
> 
> Why is it wrong??
> it worked fine on my machine(2.1, win32).
Ignoring for a moment the missing colon, the main problem is that I think 
you tested it with lists of two elements. For any other length it 
immediately becomes obvious that something is wrong:
>>> keys = ['a', 'b', 'c']
>>> values = [1, 2, 3]
>>> dict = {}
>>> for key,value in keys, values:
...     dict[key] = value
...
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ValueError: unpack list of wrong size

> 
> And what is zip supposed to do, i'm trying it here on another machine,
> which gives me a NameError(1.6 Linux)
zip(list1, list2) in Python 2.1 is roughly equivalent to map(None, list1, 
list2) except that if the lists are a different length the behaviour is 
somewhat different. It collects corresponding elements from each list 
together into a tuple.


-- 
Duncan Booth                                             duncan at rcp.co.uk
int month(char *p){return(124864/((p[0]+p[1]-p[2]&0x1f)+1)%12)["\5\x8\3"
"\6\7\xb\1\x9\xa\2\0\4"];} // Who said my code was obscure?