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Create a Minimal Great Expectations Suite Mock in Python

Build a small Python class that mimics a Great Expectations suite, storing and serializing column expectations as JSON.

great-expectations mock testing
Python
import json


class GreatExpectationsSuite:
    """A minimal mock of a Great Expectations suite."""

    def __init__(self, suite_name, expectations=None):
        self.suite_name = suite_name
        self.expectations = expectations or []

    def add_expectation(self, expectation_type, column=None, kwargs=None):
   …
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Guide: free Python code samples library

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PythonSkillset code samples are short, focused examples organised by topic and difficulty. Every snippet is server-rendered HTML — readable by search engines and easy to copy. Open any sample, read the notes, copy the code, then press Try in editor to run it in the browser with Pyodide.

How to use this library

  1. Pick a topic section — strings, lists, files, functions, and more
  2. Open a sample, read How it works, and copy the code block
  3. Run it in the IDE, tweak values, then take a related quiz or tutorial lesson

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.