Op zondag 2 februari 2014 19:10:32 UTC+1 schreef Peter Otten: > Jean Dupont wrote: > > > I'm looking for an efficient method to produce rows of tables like this: > > > > for base 2 > > 0 0 0 0 > > 0 0 0 1 > > 0 0 1 0 > > 0 0 1 1 > > 0 1 0 0 > > . > > . > > . > > 1 1 1 1 > > > > for base 3 > > 0 0 0 0 0 0 > > 0 0 0 0 0 1 > > 0 0 0 0 0 2 > > 0 0 0 0 1 0 > > 0 0 0 0 1 1 > > 0 0 0 0 1 2 > > . > > . > > 2 2 2 2 2 2 > > > > As you can see the rows are always twice the size of the base > > I _don't_ need to have all rows available together in one array which > > would become too large for higher value number bases. It's sufficient to > > produce one row after the other, as I will do further data manipulation on > > such a row immediately. > > > > If someone here could suggest best practices to perform this kind of > > operations,I'd really appreciate it very much > > Have a look at itertools.product(): > > >>> import itertools > >>> for row in itertools.product(range(2), repeat=4): > ... print(*row) > ... > 0 0 0 0 > 0 0 0 1 > 0 0 1 0 > 0 0 1 1 > 0 1 0 0 > 0 1 0 1 > 0 1 1 0 > 0 1 1 1 > 1 0 0 0 > 1 0 0 1 > 1 0 1 0 > 1 0 1 1 > 1 1 0 0 > 1 1 0 1 > 1 1 1 0 > 1 1 1 1
Thanks for the suggestion I'm going to look into it further kind regards, jean -- https://mail.python.org/mailman/listinfo/python-list
