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@melpomene
Created January 28, 2014 11:04
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Compare isinstance, type and ducktyping to see which one is quickest.
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)
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