>>> def st(num):
...     l = []
...     for x in xrange(1, num + 1):
...         str1 = ‘‘
...         for y in xrange(1, x + 1):
...             str1 = str1 + ‘%d * %d = %s    ‘ % (y, x, str(y*x))
...         l.append(str1)
...     for i in l:
...         print i
...
>>>
>>>
>>> st(3)
1 * 1 = 1
1 * 2 = 2    2 * 2 = 4
1 * 3 = 3    2 * 3 = 6    3 * 3 = 9