python 取两数的百分比

Python 2.6.6 (r266:84292, Jan 22 2014, 09:42:36) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
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>>> 6601/7869
0
>>> a = float(6601)
>>> b = float(7869)
>>> print a/b
0.838861354683
>>> print "%.3f" % (a/b)
0.839
>>> print "%.2f" % (a/b)
0.84