Is there a way to set several list elements a same value with one line code

Thu Dec 3 23:19:24 EST 2015

On 2015年12月03日 16:30:25 -0800, Robert wrote:
> Hi,
>> I remember that there is a way to set several list elements a same value
> with
> one line code. Excuse me, I don't remember the accurate syntax on the
> code snippet. But the basic format looks like this.
>> 1. There is a four-element list, such as:
> bb=[[[]],[[]],[[]],[[]]]
> 2. An assignment line is here:
> bb[0]='a'
> 3. Then, all 4 element of bb is set with the above value.
> bb=[['a'],['a'],['a'],['a']]
>> The above three line codes are what I guess (I forgot the original
> tutorial
> now). Do you remember there is such a list application?

bb = [<something> for i in range(<whatever>)]
will create bb as a list of size whatever elements each of which is 
<something>
eg:
>>> bb = [ ['a'] for i in range(4)]
>>> bb
[['a'], ['a'], ['a'], ['a']]
>>> bb = [ 0 for i in range(5)]
>>> bb
[0, 0, 0, 0, 0]
>>>
-- 
Denis McMahon, denismfmcmahon at gmail.com