Gain insights into enhancing Python data processing with PySpark. Delve into reading, transforming, aggregating data, and creating user-defined functions, boosting efficiency with Apache Spark.

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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

## Calculate the statistics of the review text length in pandas

In pandas, `applymap` can be used to calculate the length of the review text column. When we calculate the length of text, both frameworks throw a runtime exception if there are `NaN` or `None` values in the column. Therefore, missing values must be filled with inputs before applying any function.


# Calculate the statistics of the review text length in pandas

In pandas, `applymap` can be used to calculate the length of the review text column. When we calculate the length of text, both frameworks throw a runtime exception if there are `NaN` or `None` values in the column. Therefore, missing values must be filled with inputs before applying any function.


Learn how to calculate statistics in pandas and PySpark.


Distribution of the Review Text Length

Learn how to calculate statistics in pandas and PySpark.

Introduction

Data Input/Output

Data Transformation

User Defined Function (UDF)

Wrapping Up

Appendix

Distribution of the Review Text Length

Calculate the statistics of the review text length in pandas