I am beginning to think about decorators, generators, and the like. I'm
starting from zero. I've read a few PEPs, and looked at some code, and
maybe things are starting to sink in, though I don't really have enough
framework to hang it all on. It'll come. Anyway, I was trying to run some
timing code I swiped off the web, but ran into a problem with the .next()
function, which I THINK relates to the changes between how generators are
implemented between pre-3.3 and post, but I can't really tell. Here's the
code, stolen without apology from here:
http://enja.org/2011/03/09/a-python-function-timing-decorator/
import time
class Timing(object):
def __init__(self):
self.timings = {}
self.col = self.__collector()
self.col.next() #coroutine syntax
def __collector(self):
while True:
(name, t) = (yield) #coroutine syntax
if name in self.timings:
self.timings[name]["timings"] += [t]
self.timings[name]["count"] += 1
self.timings[name]["total"] += t
else:
self.timings[name] = {} #if this entry doesn't exist yet
self.timings[name]["timings"] = [t]
self.timings[name]["count"] = 1
self.timings[name]["total"] = t
def __call__(self, func):
"""Turn the object into a decorator"""
def wrapper(*arg, **kwargs):
t1 = time.time() #start time
res = func(*arg, **kwargs) #call the originating function
t2 = time.time() #stop time
t = (t2-t1)*1000.0 #time in milliseconds
data = (func.__name__, t)
self.col.send(data) #collect the data
return res
return wrapper
def __str__(self):
s = "Timings:\n"
print(dir(self))
for key in self.timings.keys():
s += "%s | " % key
ts = self.timings[key]["timings"]
count = self.timings[key]["count"]
total = self.timings[key]["total"]
s += "average: %s | total: %s | count: %s\n" % (total / count,
total, count)
return "%s" % s
if __name__ == "__main__":
timings = Timing()
@timings
def add(x,y):
for i in range(10000):
c = x + y
return c
@timings
def multiply(x,y):
for i in range(10000):
c = x * y
return c
for i in range(100):
add(3.,4.)
multiply(3., 4.)
print(timings)
And here's the error message:
Traceback (most recent call last):
File "/home/keithwins/Dropbox/Python/timer1.py", line 50, in <module>
timings = Timing()
File "/home/keithwins/Dropbox/Python/timer1.py", line 7, in __init__
self.col.next() #coroutine syntax
AttributeError: 'generator' object has no attribute 'next'
--
Keith
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