PyRank

Assertions Python Packages

Python packages with the GitHub topic assertions. Sorted by relevance, with stars and monthly downloads.
pandera-dev
pandera

A light-weight, flexible, and expressive statistical data testing library

8.8M 4K 397
srittau
asserts

Stand-alone Assertions for Python

90K 16 1
grappa-py
grappa

Behavior-oriented, expressive, human-friendly Python assertion library for the 21st century

10K 133 14
blackwell-systems
mcp-assert

The deterministic testing standard for MCP servers. Connect over real stdio/SSE/HTTP transport, call tools with real arguments, assert results with 18 assertion types defined in YAML. Any language, any transport, no mocks. Single Go binary.

10K 8 1
csparpa
fluentcheck

Fluent assertions for Python

8K 85 9
blackwell-systems
pytest-mcp-assert

The deterministic testing standard for MCP servers. Connect over real stdio/SSE/HTTP transport, call tools with real arguments, assert results with 18 assertion types defined in YAML. Any language, any transport, no mocks. Single Go binary.

4K 8 1
nlesc-nano
assertionlib

A package for performing assertions and providing informative exception messages.

3K 1 1
sbroenne
pytest-llm-assert

Natural language assertions for pytest using LLMs

1K 1 0
SentienceAPI
sentienceapi

A verification-first runtime for AI web agents — with Jest-style assertions and token-efficient snapshots

991 8 0
desplega-ai
business-use

Track, validate, and visualize business flows in production applications.

965 2 0
desplega-ai
business-use-core

Track, validate, and visualize business flows in production applications.

824 2 0
Predicate-Labs
predicate-runtime

Python SDK for Sentience AI Agent Browser Automation

687 8 0
Predicate-Labs
predicate-sdk

A verification-first runtime for AI web agents — with Jest-style assertions and token-efficient snapshots

639 8 0
GenesisCoast
conditions-py

Conditions libary for Python 3+

498 0 0
VictorKuenstler
fluent-assertions

Fluent API for assertions supporting pytest with focus on developer experience.

375 4 0
grappa-py
grappa-http

HTTP assertion plugin for grappa

345 10 3
SentienceAPI
sentience-python

Python SDK for Sentience AI Agent Browser Automation

258 8 0
tybruno
assertify

Simple, Flexible, and Extendable python3.6+ library for boolean expressions, assertions, and verifications.

248 1 0
pybrainn
ml-assert

A declarative assertion library for validating ML data and model behavior.

222 2 0
Predicate-Labs
predicatelabs

Python SDK for Sentience AI Agent Browser Automation

215 8 0
skippdot
flexible-matchers

Lightweight, zero-dependency mock assertion helpers with flexible numeric and string matching

197 1 0
Ygor-J
sql-guard

A small package for data quality rules using Standard SQL

143 5 0
abeltavares
pysertive

✔️ Assertive python design by contract toolkit for software validation. Simplify preconditions, postconditions, and invariants with easy-to-use decorators.

74 6 1