Python for Data Analysis: Step-By-Step with Projects - Applying Functions

The video tutorial explains the use of the apply method in pandas for data frames. It covers how to apply both built-in and custom functions along rows or columns, emphasizing that while the apply method is flexible, it should be a last resort due to performance considerations. The tutorial provides examples of using built-in functions like mean and custom functions, including lambda functions, and highlights alternatives for simple operations. It also introduces other apply methods like applymap and groupby, encouraging exploration of these methods for different use cases.

What is the primary purpose of the apply method in pandas data frames?

Explain how the apply method can be used to transform features in a data frame.

What are the two axes along which functions can be applied using the apply method?

Discuss the advantages and disadvantages of using the apply method compared to built-in functions.

How can custom defined functions be applied to each row of a data frame using the apply method?

What is a Lambda function and how can it be used with the apply method?

In what scenarios is it recommended to use the apply method as a last resort?

Describe how to create a new column in a data frame based on conditions from existing columns using the apply method.

What are some alternatives to the apply method for performing operations on data frames?

Summarize the key takeaways regarding the use of the apply method in pandas data frames.