So, you want to become a data scientist or may be you are already one and want to expand your tool repository. You have landed at the right place. The aim of this page is to provide a comprehensive learning path to people new to python for data analysis. This path provides a comprehensive overview of steps you need to learn to use Python for data analysis. If you already have some background, or don’t need all the components, feel free to adapt your own paths and let us know how you made changes in the path.
You can also check the mini version of this learning path –> Infographic: Quick Guide to learn Data Science in Python
Before starting your journey, the first question to answer is:
Why use Python?
How would Python be useful?
Watch the first 30 minutes of this talk from Jeremy, Founder of DataRobot at PyCon 2014, Ukraine to get an idea of how useful Python could be.
Step 1: Setting up your machine
Now that you have made up your mind, it is time to set up your machine. The easiest way to proceed is to just download Anaconda from Continuum.io . It comes packaged with most of the things you will need ever. The major downside of taking this route is that you will need to wait for Continuum to update their packages, even when there might be an update available to the underlying libraries. If you are a starter, that should hardly matter.
If you face any challenges in installing, you can find more detailed instructions for various OS here
You should start by understanding the basics of the language, libraries and data structure. The free interactive Python tutorial by DataCamp is one of the best places to start your journey. This 4 hour coding course focuses on how to get started with Python for data science and by the end you should be comfortable with the basic concepts of the language.
Specifically learn: Lists, Tuples, Dictionaries, List comprehensions, Dictionary comprehensions
Assignment: Take the interactive Python tutorial by DataCamp
Alternate resources: If interactive coding is not your style of learning, you can also look at The Google Class for Python. It is a 2 day class series and also covers some of the parts discussed later.
You will need to use them a lot for data cleansing, especially if you are working on text data. The best way to learn Regular expressions is to go through the Google class and keep this cheat sheet handy.
Assignment: Do the baby names exercise
If you still need more practice, follow this tutorial for text cleaning. It will challenge you on various steps involved in data wrangling.
This is where fun begins! Here is a brief introduction to various libraries. Let’s start practicing some common operations.
Assignment: Solve this assignment from CS109 course from Harvard.
Check out Bokeh Data Visualization Tutorial from DataCamp
Now, we come to the meat of this entire process. Scikit-learn is the most useful library on python for machine learning. Here is a brief overview of the library. Go through lecture 10 to lecture 18 from CS109 course from Harvard. You will go through an overview of machine learning, Supervised learning algorithms like regressions, decision trees, ensemble modeling and non-supervised learning algorithms like clustering. Follow individual lectures with the assignments from those lectures.
Assignment: Try out this challenge on Kaggle
Congratulations, you made it!
You now have all what you need in technical skills. It is a matter of practice and what better place to practice than compete with fellow Data Scientists on Kaggle. Go, dive into one of the live competitions currently running on Kaggle and give all what you have learnt a try!
Now that you have learnt most of machine learning techniques, it is time to give Deep Learning a shot. There is a good chance that you already know what is Deep Learning, but if you still need a brief intro, here it is.
I am myself new to deep learning, so please take these suggestions with a pinch of salt. The most comprehensive resource is deeplearning.net. You will find everything here – lectures, datasets, challenges, tutorials. You can also try the course from Geoff Hinton a try in a bid to understand the basics of Neural Networks.
Get Started with Python: A Complete Tutorial To Learn Data Science with Python From Scratch
P.S. In case you need to use Big Data libraries, give Pydoop and PyMongo a try. They are not included here as Big Data learning path is an entire topic in itself.