gistfile1.txt

def listbuzz(stop):
    for number in range(1,stop+1):
        out = []
        if (number % 3) == 0: out.append('Fizz')
        if (number % 5) == 0: out.append('Buzz')
        output = ''.join(out) if len(out) else number
    return

def stringbuzz(stop):
    for number in range(1,stop+1):
        out = ''
        if (number % 3) == 0: out += 'Fizz'
        if (number % 3) == 0: out += 'Buzz'
        output = out if len(out) else number
    return


In [19]: time listbuzz(1000000)
CPU times: user 0.56 s, sys: 0.04 s, total: 0.60 s
Wall time: 0.60 s

In [20]: time listbuzz(1000000)
CPU times: user 0.58 s, sys: 0.03 s, total: 0.60 s
Wall time: 0.61 s

In [21]: time listbuzz(1000000)
CPU times: user 0.58 s, sys: 0.02 s, total: 0.60 s
Wall time: 0.60 s

In [22]: time listbuzz(1000000)
CPU times: user 0.58 s, sys: 0.02 s, total: 0.60 s
Wall time: 0.61 s

In [23]: time stringbuzz(1000000)
CPU times: user 0.40 s, sys: 0.03 s, total: 0.44 s
Wall time: 0.44 s

In [24]: time stringbuzz(1000000)
CPU times: user 0.42 s, sys: 0.02 s, total: 0.43 s
Wall time: 0.43 s

In [25]: time stringbuzz(1000000)
CPU times: user 0.42 s, sys: 0.01 s, total: 0.43 s
Wall time: 0.43 s

In [26]: time stringbuzz(1000000)
CPU times: user 0.41 s, sys: 0.02 s, total: 0.43 s
Wall time: 0.43 s