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Is there a typical state machine implementation pattern?
...e with code. A Java implementation (pre Java8) is discussed. I was shown a Python example on GitHub as well.
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Add a prefix to all Flask routes
...
This is more of a python answer than a Flask/werkzeug answer; but it's simple and works.
If, like me, you want your application settings (loaded from an .ini file) to also contain the prefix of your Flask application (thus, not to have the va...
Secure hash and salt for PHP passwords
...e better than bcrypt in time, but it hasn't seen adoption as a standard by Linux/Unix or by webservers, and hasn't had in-depth reviews of its algorithm posted yet. But still, the future of the algorithm does look promising. If you are working with Ruby there is an scrypt gem that will help you out,...
What is a 'Closure'?
...s a function that can reference state in another function. For example, in Python, this uses the closure "inner":
def outer (a):
b = "variable in outer()"
def inner (c):
print a, b, c
return inner
# Now the return value from outer() can be saved for later
func = outer ("test")
...
Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition
...Features (SURF).
You can find a nice OpenCV code example in Java, C++, and Python on this page: Features2D + Homography to find a known object
Both algorithms are invariant to scaling and rotation. Since they work with features, you can also handle occlusion (as long as enough keypoints are visible)...
Does “untyped” also mean “dynamically typed” in the academic CS world?
...er dialects of Lisp, Smalltalk, and most scripting languages such as Perl, Python, and Ruby. Note, however, that an untyped language does not necessarily allow programs to corrupt data—this just means that all safety checking is performed at execution time. […]
[link] (note: bolding in origina...
How to force the browser to reload cached CSS/JS files?
...k.
It parses HTML on its way out of the webserver (works with PHP, rails, python, static HTML -- anything) and rewrites links to CSS, JS, image files so they include an id code. It serves up the files at the modified URLs with a very long cache control on them. When the files change, it automatic...
Optimise PostgreSQL for fast testing
...ggressively, since you really don't care when/if they make it to disk.
In Linux you can control this with the virtual memory subsystem's dirty_* settings, like dirty_writeback_centisecs.
The only issue with tuning writeback settings to be too slack is that a flush by some other program may cause a...
Is it possible to have a Subversion repository as a Git submodule?
... sets up my bare repo, then I have a cron script to update it:
#!/usr/bin/python
import os, glob
GIT_HOME='/var/www/git'
os.chdir(GIT_HOME)
os.environ['GIT_DIR']='.'
gits = glob.glob('*.git')
for git in gits:
if not os.path.isdir(git):
continue
os.chdir(os.path.join(GIT_HOME, git))
if ...
How to copy from CSV file to PostgreSQL table with headers in CSV file?
...
With the Python library pandas, you can easily create column names and infer data types from a csv file.
from sqlalchemy import create_engine
import pandas as pd
engine = create_engine('postgresql://user:pass@localhost/db_name')
df ...