What are some examples of using Dask DataFrames?

What are some examples of using Dask DataFrames?

Dask DataFrames are used for parallel computing with large datasets. For example, you can read a CSV file into a Dask DataFrame and perform operations like filtering or aggregating data.

Can you show me how to read a CSV file using Dask?

Sure! You can read a CSV file using Dask with the following code:

import dask.dataframe as dd

df = dd.read_csv('your_file.csv')

How do I perform a groupby operation on a Dask DataFrame?

You can perform a groupby operation like this:

grouped = df.groupby('column_name').mean()
``` This will compute the mean for each group in the specified column.

What if I want to save the results back to a CSV?

You can save the results back to a CSV file using:

grouped.to_csv('output_file.csv', single_file=True)
``` This will write the results to a single CSV file.