Summary and Schedule

Python is a general purpose programming language that is useful for writing scripts to work effectively and reproducibly with data.

This is an introduction to Python designed for participants with no programming experience. These lessons can be taught in one and a half days (~ 10 hours). They start with some basic information about Python syntax, the Jupyter notebook interface, and move through how to import CSV files, using the pandas package to work with data frames, how to calculate summary information from a data frame, and a brief introduction to plotting. The last lesson demonstrates how to work with databases directly from Python.

	Setup Instructions	Download files required for the lesson
Duration: 00h 00m	1. Before we start	What is Python and why should I learn it?
Duration: 00h 30m	2. Short Introduction to Programming in Python	How do I program in Python? How can I represent my data in Python?
Duration: 01h 05m	3. Starting With Data	How can I import data in Python? What is Pandas? Why should I use Pandas to work with data?
Duration: 02h 05m	4. Indexing, Slicing and Subsetting DataFrames in Python	How can I access specific data within my data set? How can Python and Pandas help me to analyse my data?
Duration: 03h 05m	5. Data Types and Formats	What types of data can be contained in a DataFrame? Why is the data type important?
Duration: 03h 50m	6. Combining DataFrames with Pandas	Can I work with data from multiple sources? How can I combine data from different data sets?
Duration: 04h 35m	7. Data Workflows and Automation	Can I automate operations in Python? What are functions and why should I use them?
Duration: 06h 05m	8. Making Plots With plotnine	How can I visualize data in Python? What is ‘grammar of graphics’?
Duration: 07h 35m	Finish

The actual schedule may vary slightly depending on the topics and exercises chosen by the instructor.

JupyterHub

For this workshop, we will use a web-based Python environment, JupyterHub, that UCSB Letters & Science IT has graciously setup for us:

Use your UCSB NETID to sign into the JupyterHub.

If you prefer to use Python on your own computer, you may use the setup instructions below, but this is not required.

Data

These files should already be downloaded if you are using JupyterHub (see above).

Data for this lesson is from the Portal Project Teaching Database. Specifically, we use the following eight data files:

• surveys.csv
• surveys2001.csv
• surveys2002.csv
• species.csv
• speciesSubset.csv
• plots.csv
• bouldercreek_09_2013.txt
• portal_mammals.sqlite

Please download them (by clicking on the corresponding links) and move them to the same directory, or download all the files as a zip which will give you everything in a single compressed file. You’ll need to unzip this file after downloading it.

Installing Python using Anaconda

Python is a popular language for scientific computing, and great for general-purpose programming as well. Installing all of the scientific packages we use in the lesson individually can be a bit cumbersome, and therefore recommend the all-in-one installer Anaconda.

Regardless of how you choose to install it, please make sure you install Python version 3.x (e.g., 3.6 is fine).

Installing Anaconda

This is not necessary if you are using JupyterHub. If you still want to install Anaconda on your local computer, select your operating system from the options below.

Windows

1. Open https://www.anaconda.com/products/individual in your web browser.

2. Download the Anaconda Python 3 installer for Windows.

3. Double-click the executable and install Python 3 using the recommended settings. Make sure that Register Anaconda as my default Python 3.x option is checked – it should be in the latest version of Anaconda.

4. Verify the installation: click Start, search and select Anaconda Prompt from the menu. A window should pop up where you can now type commands such as checking your Conda installation with:

BASH

conda --help

Video Tutorial

MacOS

1. Visit https://www.anaconda.com/products/individual in your web browser.

2. Download the Anaconda Python 3 installer for macOS. These instructions assume that you use the graphical installer .pkg file.

3. Follow the Anaconda Python 3 installation instructions. Make sure that the install location is set to “Install only for me” so Anaconda will install its files locally, relative to your home directory. Installing the software for all users tends to create problems in the long run and should be avoided.

4. Verify the installation: click the Launchpad icon in the Dock, type Terminal in the search field, then click Terminal. A window should pop up where you can now type commands such as checking your conda installation with:

BASH

conda --help

Video Tutorial

Linux

Note that the following installation steps require you to work from the terminal (shell). If you run into any difficulties, please request help before the workshop begins.

1. Open https://www.anaconda.com/products/individual in your web browser.

2. Download the Anaconda Python 3 installer for Linux.

3. Install Anaconda using all of the defaults for installation.

• Open a terminal window.
• Navigate to the folder where you downloaded the installer.
• Type bash Anaconda3- and press Tab. The name of the file you just downloaded should appear.
• Press Return
• Follow the text-only prompts. When the license agreement appears (a colon will be present at the bottom of the screen) press Spacebar until you see the bottom of the text. Type yes and press Return to approve the license. Press Return again to approve the default location for the files. Type yes and press Return to prepend Anaconda to your PATH (this makes the Anaconda distribution your user’s default Python).

4. Verify the installation: this depends a bit on your Linux distribution, but often you will have an Applications listing in which you can select a Terminal icon you can click. A window should pop up where you can now type commands such as checking your conda installation with:

BASH

conda --help

Required Python Packages

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The following are packages needed for this workshop:

• Pandas
• Jupyter notebook
• Numpy
• Matplotlib
• Plotnine

All packages apart from plotnine will have automatically been installed with Anaconda and we can use Anaconda as a package manager to install the missing plotnine package: You need to open up a Terminal, if you are using Mac OSX, or Linux (see instructions above), or launch an anaconda-promt, if you are using Windows. In your terminal window type the following:

BASH

conda install -y -c conda-forge plotnine

This will then install the latest version of plotnine into your conda environment.

Required packages: Miniconda

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Miniconda is a lightweight version of Anaconda. If you install Miniconda instead of Anaconda, you need to install required packages manually in the following way:

BASH

conda install -y numpy pandas matplotlib jupyter
conda install -c conda-forge plotnine

(Alternative) Installing required packages with environment file

Download the environment.yml file by right-clicking the link and selecting save as. In the directory where you downloaded the environment.yml file run:

BASH

conda env create -f environment.yml

Activate the new environment with:

BASH

conda activate python-ecology-lesson

You can deactivate the environment with:

BASH

conda deactivate

Launch a Jupyter notebook

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After installing either Anaconda or Miniconda and the workshop packages, launch a Jupyter notebook by typing this command from the terminal:

BASH

jupyter notebook

The notebook should open automatically in your browser. If it does not or you wish to use a different browser, open this link: http://localhost:8888.

For a brief introduction to Jupyter Notebooks, please consult our Introduction to Jupyter Notebooks page.