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

There are multiple ways to make a subset of selected columns in pandas. We can either drop the unnecessary columns using a list with `axis=1`, or provide a list of columns we’re interested in to the subset operator for pandas, `[ ]`. In the case of PySpark, the API provides a `select` method that expects either multiple comma-separated columns or a list of columns as `*args`.

> **Note:** `*args` is an unspecified number of arguments to a function.


Learn to select the useful features from the dataset.

Select a Subset of Attributes

Introduction

Data Input/Output

Data Transformation

User Defined Function (UDF)

Wrapping Up

Appendix

Select a Subset of Attributes