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What is the best way to compute trending topics or tags?
... @nixuz - am I missing something: fazscore(0.8,map(lambda x:40,range(0,200))).score(1) == 0 (for any values)?
– kͩeͣmͮpͥ ͩ
Dec 17 '10 at 5:03
...
Increasing the maximum number of TCP/IP connections in Linux
...beit a little differently.
On the client side:
Increase the ephermal port range, and decrease the tcp_fin_timeout
To find out the default values:
sysctl net.ipv4.ip_local_port_range
sysctl net.ipv4.tcp_fin_timeout
The ephermal port range defines the maximum number of outbound sockets a host can...
Using backticks around field names
...
@bobince When I was new to dev, I named a column range or something like that. When we upgraded to MySQL 5 it failed because it was a new reserved word!
– alex
Sep 17 '10 at 0:27
...
What is the best way to get all the divisors of a number?
...True:
yield reduce(lambda x, y: x*y, [factors[x][0]**f[x] for x in range(nfactors)], 1)
i = 0
while True:
f[i] += 1
if f[i] <= factors[i][1]:
break
f[i] = 0
i += 1
if i >= nfactors:
...
Creating Threads in python
...rt Thread
from time import sleep
def threaded_function(arg):
for i in range(arg):
print("running")
sleep(1)
if __name__ == "__main__":
thread = Thread(target = threaded_function, args = (10, ))
thread.start()
thread.join()
print("thread finished...exiting")
H...
What's the idiomatic syntax for prepending to a short python list?
...rom collections import deque
def list_insert_0():
l = []
for i in range(20):
l.insert(0, i)
def list_slice_insert():
l = []
for i in range(20):
l[:0] = [i] # semantically same as list.insert(0, i)
def list_add():
l = []
for i in range(20):
l = ...
Execution of Python code with -m option or not
...mandline option doc example)
$ python -m timeit '"-".join(str(n) for n in range(100))'
10000 loops, best of 3: 40.3 usec per loop
$ python -m timeit '"-".join([str(n) for n in range(100)])'
10000 loops, best of 3: 33.4 usec per loop
$ python -m timeit '"-".join(map(str, range(100)))'
10000 loops, b...
How to crop an image in OpenCV using Python
...nly 100x100 region from the upper left corner.
Slicing:
X = []
for i in range(N):
im = imread('image_i')
X.append(im[0:100,0:100]) # This will keep all N images in the memory.
# Because they are still used.
Alternatively, you can copy the relevant part by ...
Twitter image encoding challenge [closed]
...S4 which limits my resolution per character. I've also limited the maximum range to the lower end of the unicode reserved range 0xD800 however once I build a list of allowed characters and a filter to avoid them I can theoretically push the required number of characters as low as 70-100 for the logo...
Plot two histograms on single chart with matplotlib
...mport numpy
from matplotlib import pyplot
x = [random.gauss(3,1) for _ in range(400)]
y = [random.gauss(4,2) for _ in range(400)]
bins = numpy.linspace(-10, 10, 100)
pyplot.hist(x, bins, alpha=0.5, label='x')
pyplot.hist(y, bins, alpha=0.5, label='y')
pyplot.legend(loc='upper right')
pyplot.show(...