GaelVaroquaux

Cython example of exposing C-computed arrays in Python without data copies

The goal of this example is to show how an existing C codebase for numerical computing (here c_code.c) can be wrapped in Cython to be exposed in Python.

The meat of the example is that the data is allocated in C, but exposed in Python without a copy using the PyArray_SimpleNewFromData numpy

jimbojsb

Step 0:

Get Homebrew installed on your mac if you don't already have it

Step 1:

Install highlight. "brew install highlight". (This brings down Lua and Boost as well)

Step 2:

sanfx

class Namespace(object):
	"""Mock for argparse's NameSpace
	"""
	def __init__(self, lst=None, flter=None):
		super(Namespace, self).__init__()
		self.filter = flter
		self.lst = lst

	def __repr__(self):
		return 'Namespace(filter=self.filter, lst = self.lst)'

rxaviers

People

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Integralist

In Clojure you can apply destructuring within either a let binding list; function parameter list or even a macro.

A simple example would be:

(def coords [5 7]) ; define a symbol "coords" that points to a vector [5 7]
(let [[x y] coords] (println "x:" x "y:" y))
; => x: 5 y: 7

nicoddemus

Arrange files like this:

apple/
  __init__.py
  apple.py
tests/
  test_everything.py

Chort409

(ns sql-like-join
  (:require [clojure.set :refer [difference
                                 intersection
                                 union]]))

(defn inner-join
  [left-keys right-keys]
  (intersection (set left-keys) (set right-keys)))

(defn outer-join

oakes

Contents

• Why care about Rust?
• The Toolchain
• Creating a New Project
• Modules
• Crates
• Types
• References
• Mutability

PoisonAlien

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <htslib/sam.h>

int main(int argc, char *argv[]){
	
	samFile *fp_in = hts_open(argv[1],"r"); //open bam file
	bam_hdr_t *bamHdr = sam_hdr_read(fp_in); //read header
	bam1_t *aln = bam_init1(); //initialize an alignment

douglas-larocca

%%file _chi2.c
#include <Python.h>
#include <numpy/arrayobject.h>
#include "chi2.h"

static char module_docstring[] =
    "This module provides an interface for calculating chi-squared using C.";
static char chi2_docstring[] =
    "Calculate the chi-squared of some data given a model.";