Python : TypeError: can't multiply sequence by non-int of type 'float'

Your q0 value is still a string. This is basically what you're doing:

>>> q0 = '3'
>>> q1 = (q0 * 1.2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't multiply sequence by non-int of type 'float'

To fix it, convert the string to a number first:

>>> q1 = (float(q0) * 1.2)
>>> q1
3.5999999999999996

You might also want to look into the lxml and BeautifulSoup modules for parsing XML.