frompandastopyspark.tar.gz

PandasAndPyspark

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Pandas is a popular Python library used to manipulate data, but it has certain limitations in its ability to process large datasets. The Apache Spark analytics library offers significant performance improvements.

This course will help improve your Python-based data processing by leveraging Apache Spark’s multithreading capabilities through the PySpark library. You’ll start by reading data into a PySpark DataFrame before performing basic input/output functions, such as renaming attributes, selecting, and writing data. You’ll move onto transformation functions like aggregation, statistical analysis, and joins before creating custom, user-defined functions. At each step, you’ll get a quick Pandas review before being walked through leveraging the more robust PySpark library to unlock Apache Spark.

By the end of this course, you’ll be able to quickly and reliably process large amounts of data, even stored across multiple files, using PySpark.

From Pandas to PySpark DataFrame

## Task
Calculate the median review for a selected year—for example 2016—and compare it with the median review of the top product for that particular year. The top product is selected based on the total number of reviews for a particular product, such that the total review lies above the 75th percentile.
## Steps

1. Calculate the total review per product of 2016.

2. Calculate median review for a grouped DataFrame.

# Task
Calculate the median review for a selected year—for example 2016—and compare it with the median review of the top product for that particular year. The top product is selected based on the total number of reviews for a particular product, such that the total review lies above the 75th percentile.
# Steps

1. Calculate the total review per product of 2016.

2. Calculate median review for a grouped DataFrame.

Let's solve programming challenges related to UDF in PySpark.

Introduction

Data Input/Output

Data Transformation

User Defined Function (UDF)

Wrapping Up

Appendix

Challenge: User-defined Functions

Task

Steps