datacraft 0.9.0

Data Generation Through Specification

Datacraft

Datacraft: Your Synthetic Data Engine 🚀

Ever felt trapped in the endless cycle of creating mock datasets for testing or bogged down by bulky CSV files? Enter Datacraft – a sleek, JSON-driven engine that crafts synthetic data tailored to your needs. With our unique domain-specific language (DSL), designing and populating complex data structures becomes a breeze. Whether you're targeting JSON, XML, CSV, or database rows, Datacraft provides the blueprint and the toolkit.

Key Features:

• 🛠️ Versatile Data Design: Use our Data Spec and Field Spec paradigms to decouple data values from their structure.
• 🔧 Customizable: Out-of-the-box field types not cutting it? Easily define your own with our Custom Code Loading
• 🌐 Jinja2 Templating: Seamlessly integrate templating using the popular Jinja2 engine.
• 💡 Python API: Integrate directly with your test suites or applications. No need for third-party tools.
• ⚙️Command Line Magic: With just a few commands, generate millions—or even billions—of records on the fly.

Switch to Datacraft today and redefine how you generate and manage synthetic data. Dive in below to get started!

Overview

Datacraft is a tool for generating synthetic data. We do this by providing a JSON based domain specific language (DSL) for specifying the fields present in a record apart from what form the record takes. The goal is to separate the structure of the data from the values that populate it. We do this by defining two core concepts: the Data Spec and the Field Spec. A Data Spec is used to define all the fields that should be generated for a record. The Data Spec does not care about the structure of the records it will populate. A single Data Spec could be used to generate JSON, XML, a csv file, or rows in a Database. Each field in the Data Spec is described by a Field Spec. A Field Spec defines how the values for a field should be generated. There are a variety of built-in field types that can be used to describe the data structure and format for fields. Where the built-in types are not sufficient, there is an easy way to create custom types and handlers for them using Custom Code Loading. The datacraft tool supports templating using the Jinja2 templating engine format.

Data is a key part of any application. Synthetic data can be used to test and exercise a system while it is under development or modification. By using a Data Spec to generate this synthetic data, it is more compact and easier to modify, update, and manage. It also lends itself to sharing and reuse. Instead of hosting large data files full of synthetic test data, you can build Data Specs that encapsulate the information needed to generate the data. If well-designed, these can be easier to inspect and reason through compared with scanning thousands of lines of a csv file. datacraft makes it easy to generate millions or billions of records to use for development and testing of new or existing systems. Datacraft also has a python API so that you can generate your synthetic data as part of your test suite or application without have to use online tools or external services.

Docs

Find the latest documentation and detailed usage information here: datacraft.readthedocs.io

Installation

$ pip install datacraft

$ datacraft -h # for full command line usage

Basic Usage

Command Line

$ datacraft type-list # list all available field spec types ...

$ datacraft --type-help combine
INFO [05-Jun-2050 05:52:59 PM] Starting Loading Configurations...
INFO [05-Jun-2050 05:52:59 PM] Loading custom type loader: core
INFO [05-Jun-2050 05:52:59 PM] Loading custom type loader: xeger
-------------------------------------
combine | Example Spec:
{
  "name": {
    "type": "combine",
    "refs": ["first", "last"],
    "config": {
      "join_with": " "
    }
  },
  "refs": {
    "first": {
      "type": "values",
      "data": ["zebra", "hedgehog", "llama", "flamingo"]
    },
    "last": {
      "type": "values",
      "data": ["jones", "smith", "williams"]
    }
  }
}
datacraft -s spec.json -i 3 --format json -x -l off
[{"name": "zebra jones"}, {"name": "hedgehog smith"}, {"name": "llama williams"}]

Python API

import datacraft

spec = {
    "id": {"type": "uuid"},
    "timestamp": {"type": "date.iso.millis"},
    "handle": {"type": "cc-word", "config": { "min": 4, "max": 8, "prefix": "@" } }
}

print(*datacraft.entries(spec, 3), sep='\n')

{'id': '40bf8be1-23d2-4e93-9b8b-b37103c4b18c', 'timestamp': '2050-12-03T20:40:03.709', 'handle': '@WPNn'}
{'id': '3bb5789e-10d1-4ae3-ae61-e0682dad8ecf', 'timestamp': '2050-11-20T02:57:48.131', 'handle': '@kl1KUdtT'}
{'id': '474a439a-8582-46a2-84d6-58bfbfa10bca', 'timestamp': '2050-11-29T18:08:44.971', 'handle': '@XDvquPI'}

Type Help

import datacraft

# List all registered types:
datacraft.registered_types()
['calculate', 'char_class', 'cc-ascii', 'cc-lower', '...', 'uuid', 'values', 'replace', 'regex_replace']

# Print API usage for a specific type or types
print(datacraft.type_usage('char_class', 'replace', '...'))
# Example Output
"""
-------------------------------------
replace | API Example:

import datacraft

spec = {
 "field": {
   "type": "values",
   "data": ["foo", "bar", "baz"]
 },
 "replacement": {
   "type": "replace",
   "data": {"ba": "fi"},
   "ref": "field"
 }
}

print(*datacraft.entries(spec, 3), sep='\n')

{'field': 'foo', 'replacement': 'foo'}
{'field': 'bar', 'replacement': 'fir'}
{'field': 'baz', 'replacement': 'fiz'}
"""

For more detailed documentation please see: datacraft.readthedocs.io