Python for Data Analysis

Course in data science. Learn to analyze data of all types using the Python programming language. No programming experience is necessary.

Quick links: 📁 lessons ⏬ Lesson Schedule

Software covered:

• Python 3
• IPython environment and Jupyter notebooks
• Conda for package management and virtual environments

Course topics include:

• The UNIX command line
• Fundamentals of Python and its data types
• Data analysis packages Numpy and Pandas
• Plotting packages Matplotlib and Seaborn
• Statistics
• Regular expressions
• Interactive visualization
• Modules and classes
• Git and GitHub

Instructor

• Luke Thompson, Ph.D.
• Assistant Research Professor, NOAA Northern Gulf Institute, Atlantic Oceanographic and Meteorological Laboratory, Miami, Florida
• Email: [email protected]
• Pages: GitHub, Google Scholar, NOAA profile

Online Content

• GitHub repository: cuttlefishh/python-for-data-analysis
• YouTube channel: https://www.youtube.com/channel/UCVZrIrWtcvTzYlrNx7RcDyg

Textbooks

• Learn Python 3 the Hard Way by Zed Shaw (Addison-Wesley) -- Step-by-step introduction to Python with no prior knowledge assumed; includes appendix Command Line Crash Course.
• Learning Python 3rd Edition by Mark Lutz (O'Reilly) -- Optional; more traditional introduction to Python as a computer language.
• Python for Data Analysis 2nd Edition by Wes McKinney (O'Reilly) -- Manual focused on Pandas, the popular Python package for data analysis, by its creator. GitHub page: wesm/pydata-book.

O'Reilly Media titles are free to UCSD affiliates with Safari Books Online.

Additional Materials

Command Line Resources

• Git for Windows -- BASH emulator and Git software for Windows
• Learning the Shell -- Great intro to the Unix shell
• Unix Tutorial by Julian Catchen -- From Evomics 2015 workshop in Czech Republic
• Learn the Command Line -- Code Academy
• Learn Unix The Hard Way by Zed Shaw -- More detail than you will get from Appendix A of Shaw's LPTHW

Python Resources

• MIT OpenCourseWare
• SciPy Lectures
• MatPlotLib Cheatsheet

IPython Resources from Cyrille Rossant

• IPython Interactive Computing and Visualization Cookbook
• Learning IPython for Interactive Computing and Data Visualization -- GitHub repo

Data Analysis Resources

• 10-minute Tour of Pandas by Wes McKinney -- Basic video tour
• R vs. Python for Data Analysis -- Fun cartoon to abate or fuel your biases
• Python Scripting for Computational Science by H. P. Langtangen -- Deeper and more mathematical treatment
• An Introduction To Applied Bioinformatics by Greg Caporaso
• A Dramatic Tour through Python's Data Visualization Landscape

Course Philosophy

1. You learn Python by doing, just like anything else. With a few exceptions, you're not going to break your computer by trying new commands. So just try it and see what happens. Print output of commands. Print values of variables. Kick the thing until it works.
2. Resist the urge to get frustrated and blame the computer when your code doesn't run. Computers are deterministic machines; it's almost always your fault. But that's OK! Your computer will give you error messages that describe what went wrong. Read them and try to understand them.
3. When you don't know how to do something, google it. You'll be amazed by the solutions you'll find to do thing x if you google "python thing x".
4. Learn keyboard shortcuts, as many as you can. Tab-complete in the shell and IPython/Jupyter!
5. Remember Zed's sage wisdom:
   • Practice every day.
   • Don't over-do it. Slow and steady wins the race.
   • It's alright to be totally lost at first.
   • When you get stuck, get more information.
   • Try to solve it yourself first.

Assignments and Grading

Weekly Assignments

Weekly take-home assignments will follow the course schedule, reinforcing skills with exercises to analyze and visualize scientific data. Assignments will given out on Wednesdays and will be due the following Wednesday, using TritonEd. Assignments are worth 8 points each and will be graded on effort, completeness, and accuracy.

Final Project

You will choose a dataset of your own or provided in one of the texts and write a Python program (or set of Python programs or mixture of .ipynb and .py/.sh scripts) to carry out a revealing data analysis or create a software tool. Have a look at Shaw Ex43-52 and McKinney Ch10-12 for more ideas. The final project is worth 20 points and will be graded on effort, creativity, and fulfillment of the requirements below.

Requirements:

• Submit your project as either: a Jupyter notebook (or collection of notebooks), a Python script (or collection of scripts), or a combination of the two.
• Use pandas and one or more package from at least three (≥3) of the categories below:
  • Plotting: matplotlib, seaborn
  • Interactive visualization: bokeh, pygal, plotly, mpld3, nvd3
  • Statistics and modeling: scipy, statsmodels, scikit-learn
  • Bioinformatics: scikit-bio, biopython
  • Climate science: cdms, iris
  • Any other domain-specific library/package
• Use at least three (≥3) user-defined functions.
• Optional: Create user-defined modules and classes for use in your code.
• Optional: Share your code on GitHub.

Grading

There are 100 points total possible for the course:

• Assignments: 72 points (9 assignments x 8 points each)
• Final project: 20 points
• Participation: 8 points

Participation is based on completing the pre-course survey, showing up to class (when you are able), and completing the course evaluation (this is on the honor system as I won't know who completes it). There are no midterm or final exams.

Schedule Overview

The course consists of 20 lessons. As a class, it is taught as two lessons per week for 10 weeks, but the material can be covered at any pace.

Lessons 1-3 will be an introduction to the command line. By the end of this tutorial, everyone will be familiar with basic Unix commands.

Lessons 4-9 will be an introduction to programming using Python. The main text will be Shaw's Learn Python 3 the Hard Way. For those with experience in a programming language other than Python, Lutz's Learning Python will provide a more thorough introduction to programming Python. We will learn to use IPython and IPython Notebooks (also called Jupyter Notebooks), a much richer Python experience than the Unix command line or Python interpreter.

Lessons 10-18 will focus on Python packages for data analysis. We will work through McKinney's Python for Data Analysis, which is all about analyzing data, doing statistics, and making pretty plots. You may find that Python can emulate or exceed much of the functionality of R and MATLAB.

Lessons 19-20 conclude the course with two skills useful in developing code: writing your own classes and modules, and sharing your code on GitHub.

Lesson Schedule

Lessons are available as .md or .ipynb files by clicking on the lesson numbers below. Readings should be completed while typing out the code (this is integral to the Shaw readings) and doing any Study Drills (Shaw) and Chapter Quizzes (Lutz).