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What exactly is Arel in Rails 3.0?
... can think of it as a Ruby version of the LINQ standard query operators or Python's SQLAlchemy. (In fact, the author explicitly cites both LINQ and SQLAlchemy as inspirations.)
Or, you can see it as a replacement for named_scopes. In fact, ARel is pretty much the realization of the idea that "every ...
surface plots in matplotlib
...ct, interactive, fixed, interact_manual
import ipywidgets as widgets
from IPython.display import Image
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt
import numpy as np
from mpl_toolkits import mplot3d
def f(x, y):
return np.sin(np.sqrt(x ** 2 + y ** 2))
def plot(i):
...
Parsing command-line arguments in C?
...ptions, docopt infers and creates an argument parser. This got started in python; the python version literally just parses the docstring and returns a dict. To do this in C takes a little more work, but it's clean to use and has no external dependencies.
...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...
Python and SQLAlchemy are not mentioned in the question.
– Alexander Emelianov
Nov 1 '17 at 12:04
...
What is the purpose of backbone.js?
...enraets.org/blog/2012/01/…
– Jeffrey Nicholson Carré
Nov 22 '12 at 17:27
17
This answer is wro...
How do Trigonometric functions work?
...oximation, you should NOT be using it. That goes for Taylor, Chebyshev, Padé, etc. series. Taylor series are often Good Enough.
– kquinn
Feb 7 '09 at 22:52
4
...
Handling click events on a drawable within an EditText
...p() to y in order to get the correct position.
– André
Mar 25 '13 at 14:16
3
Actually you should...
PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
...ame it back
Restore the dump
The magic is done.
I've written two rows in Python to do that; I hope they can help someone (in-2-seconds-written-code, don’t use it in production):
import os
import sys
import pg
# Take the new schema name from the second cmd arguments (the first is the filename)
...
Verify a certificate chain using openssl verify
...ed for Intermediate.pem if it is possible that the following happens: mail.python.org/pipermail/cryptography-dev/2016-August/…
– Greg Smethells
Mar 17 '17 at 20:34
2
...
Wrap a delegate in an IEqualityComparer
...ot the comparison itself.
This could be an elegant solution (concept from Python's list sort method).
Usage:
var foo = new List<string> { "abc", "de", "DE" };
// case-insensitive distinct
var distinct = foo.Distinct(new KeyEqualityComparer<string>( x => x.ToLower() ) );
The KeyE...