Arnaud Delobelle wrote:
> jzakiya <[EMAIL PROTECTED]> writes:
>
>> I looked online and in books, but couldn't find a definitive answer to
>> this.
>>
>> I have an array and set multiple elements to either True or False at
>> one time.
>>
>> Question: Which way is faster (or does it matter)?
>>
>> 1)
>>
>> array[x1]=array[x2]=........= array[x10] = \
>> array[x11]=array[x12]=... = array[x20] = \
>> ......
>> ......
>> array[x40]=array[x41]=....= array[x50] = False (or True)
>>
>>
>> 2)
>>
>> array[x1]=array[x2]=........= array[x10] = False
>> array[x11]=array[x12]=... = array[x20] = False
>> ......
>> ......
>> array[x40]=array[x41]=....= array[x50] = False
>
> It doesn't matter as none of this is valid Python. In Python you have to
> write
>
> array[x1] = False
> array[x2] = False
>
> Etc...
>
No.
l = range(10)
l[0] = l[1] = 100
And there seems to be a small difference between both versions,
but I can't judge for sure if that favors one of them - yet I tend to think
it's not worth the effort...
import dis
def a():
l = range(10)
l[0] = l[1] = 100
def b():
l = range(10)
l[0] = 100
l[1] = 100
print "------------ a ---------------"
dis.dis(a)
print "------------ b ---------------"
dis.dis(b)
------------ a ---------------
4 0 LOAD_GLOBAL 0 (range)
3 LOAD_CONST 1 (10)
6 CALL_FUNCTION 1
9 STORE_FAST 0 (l)
5 12 LOAD_CONST 2 (100)
* 15 DUP_TOP
16 LOAD_FAST 0 (l)
19 LOAD_CONST 3 (0)
22 STORE_SUBSCR
23 LOAD_FAST 0 (l)
26 LOAD_CONST 4 (1)
29 STORE_SUBSCR
30 LOAD_CONST 0 (None)
33 RETURN_VALUE
------------ b ---------------
8 0 LOAD_GLOBAL 0 (range)
3 LOAD_CONST 1 (10)
6 CALL_FUNCTION 1
9 STORE_FAST 0 (l)
9 12 LOAD_CONST 2 (100)
15 LOAD_FAST 0 (l)
18 LOAD_CONST 3 (0)
21 STORE_SUBSCR
10 22 LOAD_CONST 2 (100)
25 LOAD_FAST 0 (l)
28 LOAD_CONST 4 (1)
31 STORE_SUBSCR
32 LOAD_CONST 0 (None)
35 RETURN_VALUE
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