>>> a=13.946

>>> print(a)

13.946

>>> print("%.2f" % a)

13.95

>>> round(a,2)

13.949999999999999

>>> print("%.2f" % round(a,2))

13.95

>>> print("{0:.2f}".format(a))

13.95

>>> print("{0:.2f}".format(round(a,2)))

13.95

>>> print("{0:.15f}".format(round(a,2)))

13.949999999999999

или через f-строку (Python 3.6+):

f"Result is {result:.2f}"