why this happend using model random?

[Fredrik Lundh]

"flyaflya" wrote:

> from random import *
>
> col = [0 for i in range(10)]
> a = [col for  i in range(10)]

http://www.python.org/doc/faq/programming.html#how-do-i-create-a-multidimensional-list

> seed()
> for i  in range(10):
>     for j in  range(10):
>         a[i][j] = randint(0, 100)
> print a
>
> the result is:
> [[78, 65, 35, 5, 68, 60, 1, 51, 81, 70],
> [78, 65, 35, 5, 68, 60, 1, 51, 81, 70],
> [78, 65, 35, 5, 68, 60, 1, 51, 81, 70], .....]
> why result isn't true random?

because you've assigned all the values to the same list ("col").  see the link above
for details.

</F>