Given an AWS credentials file that looks like this: [default] aws_access_key_id = DEFAULT aws_secret_access_key = SECRET1 [dev] aws_access_key_id = DEV aws_secret_access_key = SECRET2 [prod] aws_access_key_id = PROD aws_secret_access_key = SECRET3 You can use any profile, say dev, like this in…
After pip install bybrain, the PyBrain the quick start essentially goes as follows: from pybrain.tools.shortcuts import buildNetwork from pybrain.structure import TanhLayer from pybrain.datasets import SupervisedDataSet from pybrain.supervised.trainers import BackpropTrainer # Create a neural network with two inputs, three hidden, and…
The problem: Given two random samples, s1 and s2, of size k over two disjoint populations, p1 and p2, how to combine the two k-sized random samples into one k-sized random sample over p1 ∪ p2? The solution: k times,…
Get the current weather for Copenhagen: import urllib2 import json # hent vejret for Koebenhavn url = ‘,dk’ response = urllib2.urlopen(url) # parse JSON resultatet data = json.load(response) print ‘Weather in Copenhagen:’, data[‘weather’][0][‘description’]
This is my base pattern for writing a parser in Python by using the pyparsing library. It is slightly more complicated than a hello world in pyparsing, but I think it is more useful as a small example of writing…
A tip: Decode early, Unicode everywhere, encode late
Gratefully making use of what others have provided, i.e. geopy, Google and plpythonu. Type to hold result of geocoding: CREATE TYPE geocoding AS ( place text, latitude double precision, longitude double precision ); Function that does the actual geocoding (to…
Docker is a cool idea and open-source product, that seems to be taking the tech community by storm. Wired will tell you why it is cool in a story titled The Man Who Built a Computer the Size of the…
The profiling tool in GNU is called gprof. Here is a short, boring example of how to use it. 1) Write hello world in C (hello.c) #include int foo() { int b = 54324; int j; for (j=0; j <…
Peter Eisentraut has written some good slides on coding PostgreSQL clients in Python and on using Python as a stored procedures language in PostgreSQL. First half deals with using Python as a Postgres client. Second half deals with coding stored…