Add sample code

Author: gjbex

source-code/README.md

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+# Source code
+
+This is source code that is either used in the presentation, or was developed
+to create it.  There is some material not covered in the presentation as well.
+
+## Requirements
+
+* Python version: at least 3.6
+* Packages (names listed taht can be used with `pip` or `conda` to install):
+  * cython
+  * dask
+  * numpy
+  * numexpr
+  * scipy
+  * matplotlib
+  * mpi4py
+  * pytables
+  * jupyter
+  * ipywidgets
+
+
+## What is it?
+
+1. `cython`: illustrations of how to use Cython to speed up Python.
+1. `dask`: examples of how to use dask for distributed computing.
+1. `interfaciing-c-c++-fortran`: illustrations of ctypes, SWIG and
+   f2py to interface with C, C++ and Fortran code.
+1. `ising`: example of speeding up a Python simulation by wrapping
+   C++ code using SWIG.
+1. `mpi4py`: illustrations of distributed programming using MPI.
+1. `multiprocessing`: illustrations of multithreaded programming
+   using multiprocessing.
+1. `numba`: illustration of using the numba library.
+1. `profiling`: some illustrations and how-to on profiling a Python
+   application.
+1. `pyspark`: illustrations of using PySpark.

source-code/cython/.gitignore

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+build
+*.so