Compare isinstance, type and ducktyping to see which one is quickest.

compare_duck_type_speed.py

import time

"""" 
Compare isinstance, type and ducktyping to see which one is quickest.

Typical output
=============
IsInstance 0.00567038607597
ducktyping 0.0232819545269
type 0.004327688694

""""
def first(i):
    return isinstance(i, float)

def second(i):
    try:
        i.is_integer()
        return True
    except:
        return False

def third(i):
    return type(i)== float

tot1=0
tot2=0
tot3=0
loops = 1000

for j in xrange(loops):
    t = time.time()
    a = map(lambda i: first(i), xrange(10000))
    tot1 += time.time() -t


    t = time.time()
    a = map(lambda i: second(i), xrange(10000)) 
    tot2 += time.time() -t


    t = time.time()
    a = map(lambda i: third(i), xrange(10000)) 
    tot3 += time.time() -t

print "IsInstance", tot1 / float(loops)
print "ducktyping", tot2 / float(loops) 
print "type", tot3 / float(loops)