Rexpy Stats

We previously added rexpy to the Python tdda module. Rexpy is used to find regular expressions from example strings.

One of the most common requests from Rexpy users has been for information regarding how many examples each resulting regular expression matches.

We have now added a few methods …

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Since the last post, we have extended the reference test functionality in the Python tdda library. Major changes (as of version 0.2.5, at the time of writing) include:

• Introduction of a new ReferenceTest class that has significantly more functionality from the previous (now deprecated) WritableTestCase.
• Support for pytest …

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Motivation

There's a Skyscanner data feed we have been working with for a year or so. It's produced some six million records so far, each of which has a transaction ID consisting of three parts—a four-digit alphanumeric transaction type, a numeric timestamp and a UUID, with the three parts …

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Background

We recently extended the tdda library to include support for automatic discovery of constraints from datasets, and for verification of datasets against constraints. Yesterday's post—Constraint Discovery and Verification for Pandas DataFrames—describes these developments and the API.

The library we published is intended to be a base for …

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Background

In a previous post, Constraints and Assertions, we introduced the idea of using constraints to verify input, output and intermediate datasets for an analytical process. We also demonstrated that candidate constraints can be automatically generated from example datasets. We prototyped this in our own software (Miró) expressing constraints as …

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