50 Data Science, Machine Learning Cheat Sheets, updated

If we missed some popular cheat sheets, add them in the comments below. Data science is a multi-disciplinary field. Thus, there are thousands of packages and hundreds of programming functions out there in the data science world! An aspiring data enthusiast need not know all. A cheat sheet or reference card is a compilation of mostly used commands to help you learn that language's syntax at a faster rate.