Created
August 16, 2012 07:49
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setdault too slow problem
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import timeit | |
def debug(func, var): | |
print "Timing", func, | |
stmt = lambda: func(var) | |
tm = timeit.Timer(stmt=stmt) | |
res = tm.timeit(10000) | |
lst = stmt() | |
print "%1.10f" % (res*1000) | |
for key,val in sorted(lst.iteritems(), key=lambda x: x[1]): | |
print "%4dx %s" % (len(val),key) | |
print "" | |
def test1(iterable): | |
values = {} | |
for element in iterable: | |
values.setdefault(element.name, []).append(element) | |
return values | |
def test2(iterable): | |
values = {} | |
for element in iterable: | |
if element.name not in values: | |
values[element.name]=[element] | |
else: | |
values[element.name].append(element) | |
return values | |
def test3(iterable): | |
values = {} | |
cur_name = None | |
cur_list = None | |
for element in iterable: | |
if element.name != cur_name: | |
values[cur_name] = cur_list | |
cur_name = element.name | |
cur_list = [] | |
cur_list.append(element) | |
if cur_list: | |
values[cur_name] = cur_list | |
del values[None] | |
return values | |
class obj(object): | |
def __init__(self, name, val): | |
self.name = name | |
self.val = val | |
xx = [[obj("name%d" % (i), i*j) for i in range(10)] for j in range(5)] | |
x = sorted(sum(xx, []), key=lambda x: x.name) | |
debug(test1,x) | |
debug(test2,x) | |
debug(test3,x) |
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