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

## Conversion in pandas

In pandas, the `melt` method is used to transform a wide format data into long format data. Most of data visualization tools, such as Tableau and PowerBI, prefer the _long_ format over the _wide_ format when creating charts that compare certain metrics between two or more groups.


# Conversion in pandas

In pandas, the `melt` method is used to transform a wide format data into long format data. Most of data visualization tools, such as Tableau and PowerBI, prefer the _long_ format over the _wide_ format when creating charts that compare certain metrics between two or more groups.


Learn to save a filtered snapshot in pandas and PySpark.

Introduction

Data Input/Output

Data Transformation

User Defined Function (UDF)

Wrapping Up

Appendix

Conversion Between Wide and Long Format using melt and pivot

Conversion in pandas