Python FizzBuzz with modulo comparisons

fizzbuzz_modulo.py

import cProfile
import pstats
import StringIO

pr = cProfile.Profile()
pr.enable()

iNot = set()
iFizz = set()
iBuzz = set()
iFizzBuzz = set()
span = range(1, 101)


def calc2():
    for num in span:
        if num % 3.0 == 0 and num % 5.0 == 0:
            iFizzBuzz.add(num)
        elif num % 3.0 == 0:
            iFizz.add(num)
        elif num % 5.0 == 0:
            iBuzz.add(num)
        else:
            iNot.add(num)


def calc1():
    for num in span:
        if num % 3.0 == 0 or num % 5.0 == 0:
            if num % 3.0 == 0 and (num % 5.0 == 0):
                iFizzBuzz.add(num)
            elif num % 5.0 == 0:
                iBuzz.add(num)
            else:
                iFizz.add(num)
        else:
            iNot.add(num)


def calc3():
    for num in span:
        is_mod3 = (num % 3.0 == 0)
        is_mod5 = (num % 5.0 == 0)

        if not (is_mod3 or is_mod5):
            iNot.add(num)
        elif is_mod3 and not is_mod5:
            iFizz.add(num)
        elif is_mod5 and not is_mod3:
            iBuzz.add(num)
        else:
            iFizzBuzz.add(num)


def calc():
    for num in span:
        if (num % 3) == 0 and (num % 5 == 0):
            iFizzBuzz.add(num)
        elif num % 3 == 0:
            iFizz.add(num)
        elif num % 5 == 0:
            iBuzz.add(num)
        else:
            iNot.add(num)

for i in xrange(0, 1000000):
    iNot.clear()
    iFizz.clear()
    iBuzz.clear()
    iFizzBuzz.clear()

    calc()
pr.disable()

print "3's: {}".format(len(iFizz))
print "5's: {}".format(len(iBuzz))
print "both: {}".format(len(iFizzBuzz))
print "neither: {}".format(len(iNot))

s = StringIO.StringIO()
sortby = 'cumulative'
ps = pstats.Stats(pr, stream=s).sort_stats(sortby)
ps.print_stats()
print s.getvalue()