Python for Matlab Users - CSDMS · Python for Matlab Users ... Python Snakes Its Way Into HPC Andy Terrel: Getting Started with Python in HPC Python Tutorial Think Python

CU Research Computing: University of Colorado Boulder

Python for Matlab UsersThomas Hauser Director of Research Computing [email protected] 

Monte Lunacek HPC Application Specialist [email protected] 

Who are we?

CU Research Computing: University of Colorado Boulder 2/30

What is Python?

CU Research Computing: University of Colorado Boulder 3/30

What is Python?

CU Research Computing: University of Colorado Boulder

Flexible, powerful programming language

Easy, clean syntaxVery readable codeBalanced high level programming with low­level optimization

Large community of support

Free as in free beerFree as in free speech

·Object orientedRuns everywhereTesting framework

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Pyrex, CythonF2py

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·Modular system, large number of libraries­

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Minimum packages for computationalscience

CU Research Computing: University of Colorado Boulder

python: the base languagenumpy: arrays, fast operations on arraysscipy: higher level computational routinesmatplotlib: plottingipython: notebooks, flexible shell, and parallelpandas: data analysis

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What can you do with Python?

CU Research Computing: University of Colorado Boulder

OS support: manage files and directoriesGlue existing applicationsLAPACK and BLAS: access powerful C and Fortran librariesParallelData AnalysisVisualizationGUI programmingScrape websitesBuild websitesAnything!

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OutlinePart One

Part Two

CU Research Computing: University of Colorado Boulder

Python Overview (30 minutes)

Lab (10 minutes)Break (10 minutes)

·IPython and NotebookFunctions, lists, and Dictionaries

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Numpy (20 minutes)Plotting with Matplotlib (10 minutes)Lab (10 minutes)Data Analysis (20 minutes)

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Python OverviewTest driving three ways to interact with PythonFunctions, lists, dictionaries

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Hello World

What do you notice about this code?

CU Research Computing: University of Colorado Boulder

#!/Users/mlunacek/anaconda/bin/python

def say_hello(): print 'hello world'

say_hello()

PYTHON

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Three ways to run

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Terminal

CU Research Computing: University of Colorado Boulder

$ ls hello_world.py hello_world.py$ python hello_world.py hello world$ ./hello_world.py hello worldbash-mac$

BASH

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IPython shell

CU Research Computing: University of Colorado Boulder

OS supportFormatted printTab Completion%run

HistoryIntrospection (?,??)%paste and %cpaste

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Persistence­···

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Quick Introduction to Python

How

CU Research Computing: University of Colorado Boulder

FunctionsListsDictionaries

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IPython terminalNotebook

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/Users/mlunacek/Documents/tutorials/python/python_hpc/Python4Matlab

data_analysis

dictionary_and_lab

functions_and_lists

matplotlib

numpyTutorial

python4matlab

To import a notebook, drag the file onto the listing below or click here.

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CU Research Computing: University of Colorado Boulder

Lab and BreakDictionaries

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Endthought

http://www.enthought.com/

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Anaconda

https://store.continuum.io/cshop/anaconda

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Github

https://github.com/ResearchComputing/python_hpc

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Lab

CU Research Computing: University of Colorado Boulder

Go to the directory where you dowloaded the codeunzip the fileNavigate to Python4MatlabLaunch IPython Notebook

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ipython notebook

dictionary_and_lab

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/Users/mlunacek/Documents/tutorials/python/python_hpc/Python4Matlab

data_analysis

dictionary_and_lab

functions_and_lists

matplotlib

numpyTutorial

python4matlab

To import a notebook, drag the file onto the listing below or click here.

CU Research Computing: University of Colorado Boulder 20/30

CU Research Computing: University of Colorado Boulder

Numpy and Matplotlib

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/Users/mlunacek/Documents/tutorials/python/python_hpc/Python4Matlab

data_analysis

dictionary_and_lab

functions_and_lists

matplotlib

numpyTutorial

python4matlab

To import a notebook, drag the file onto the listing below or click here.

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CU Research Computing: University of Colorado Boulder

Lab 2Numpy and Matplotlib

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/Users/mlunacek/Documents/tutorials/python/python_hpc/Python4Matlab

data_analysis

dictionary_and_lab

functions_and_lists

matplotlib

numpyTutorial

python4matlab

To import a notebook, drag the file onto the listing below or click here.

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CU Research Computing: University of Colorado Boulder

PandasData Analysis

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/Users/mlunacek/Documents/tutorials/python/python_hpc/Python4Matlab

data_analysis

dictionary_and_lab

functions_and_lists

matplotlib

numpyTutorial

python4matlab

To import a notebook, drag the file onto the listing below or click here.

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What did we learn?

CU Research Computing: University of Colorado Boulder

Python's syntax is cleanNotebook, IPython terminalData structures

Ways to act on these containersPlotting with matplotlib

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Lists, dictionaries,numpy arrayspandas DataFrame

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What's next?

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Links

CU Research Computing: University of Colorado Boulder

Scientific Programming: scipyParallel Computing

Performance

Templates: jinja2SQL database: sqlalchemyWebsites: djangoHardware Raspbery Pi

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IPython Parallelmpi4py

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·profilingf2pycythonctypes

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References

Thank you!

CU Research Computing: University of Colorado Boulder

Python Scripting for Computational SciencePython Snakes Its Way Into HPCAndy Terrel: Getting Started with Python in HPCPython TutorialThink PythonEnthoughtAnacondaData Analysis with Python

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