dry-python/returns

Features

• Python Functional Programming Libraries - Provides a comprehensive toolkit of functional programming primitives and type-safe containers specifically for Python.
• Monadic Error Handling - Replaces traditional try-catch blocks and null checks with type-safe Result and Optional containers to treat exceptions as data.
• Monadic Containers - Provides type-safe monadic containers like Result and Optional to manage success, failure, and optionality.
• Type-Safe Container Wrapping - Encapsulates data within specialized containers to handle nulls, exceptions, and async contexts explicitly.
• Mypy Plugins - Ships a specialized Mypy plugin to validate higher-kinded types and functional pipelines during static analysis.
• Optional Value Types - Wraps values to explicitly distinguish between the presence and absence of data to prevent reference errors.
• Optional Value Extractions - Provides operations to unwrap values from side-effect or optional containers for compatibility with imperative APIs.
• Container Value Mapping - Applies pure functions to values inside containers via mapping and binding to produce updated containers.
• Monadic Async Wrapping - Wraps async operations in containers to compose non-blocking computations and handle exceptions without repetitive await statements.
• Container Value Lifting - Transforms standard functions into operations that can process containerized values within a functional pipeline.
• Partial Application - Creates new functions by pre-filling a subset of the original function arguments while maintaining type safety.
• Higher-Kinded Type Simulation - Simulates higher-kinded types to allow generic functions to operate across various container types.
• Monadic Do Notation - Implements syntactic patterns for sequencing monadic actions to avoid deeply nested function calls while preserving type safety.
• Do-Notation Type Validation - Enforces type consistency within monadic do-notation blocks through static analysis to prevent mixing container types.
• Monadic Sequence Wrapping - Sequences multiple container-wrapped values into a single result using a linear syntax that handles wrapping automatically.
• Container Presence Matching - Employs structural pattern matching to execute different logic paths based on whether a container value is present.
• Container State Matching - Uses structural pattern matching to execute logic based on whether a value is present or missing in a container.
• Container Value Matching - Uses structural pattern matching to extract values or handle failure cases from result and optional containers.
• Function Currying - Transforms functions to accept arguments individually through successive calls.
• Functional Pipeline Composition - Enables the composition of execution pipelines by chaining multiple operations into a declarative sequence.
• Result-Based Control Flows - Directs program logic through separate success and failure tracks using explicit result-type containers.
• Side Effect Marking - Provides mechanisms to explicitly distinguish functions that perform side effects from pure functions.
• Result Types - Captures the outcome of a function as a typed result container to eliminate uncaught exceptions.
• Functional Data Pipelines - Provides sequences of operations that transform data using immutable functions and declarative processing logic.
• Container Computation Chaining - Sequences operations using mapping and binding to flow data through type-safe containers.
• Container Context Binding - Implements monadic binding to chain computations while preserving the operational state within containers.
• Function Interface Adaptation - Adapts functions that return containers to accept container inputs, enabling declarative functional composition.
• Dynamic Error Containers - Uses containers to represent success or failure, enabling a linear data flow without try-catch blocks.
• Exception Capture - Converts functions that throw exceptions into structured success or failure types to treat errors as data.
• Pure Functional Cores - Isolates side effects and impure operations from pure business logic to improve testability and architectural clarity.
• Deferred Dependency Injections - Defers the injection of dependencies until the final execution phase to enable pure function composition.
• Contextual Function Composition - Chains together pure, impure, or asynchronous functions that depend on external environments while maintaining type safety.
• Function Composition - Merges two single-argument functions into a single composite operation for predictable data flow.
• Multiple Container Composition - Sequences operations across multiple type-safe containers using declarative syntax to prevent nested container layers.
• Optional Value Handling - Wraps optional values in a container to force explicit handling of empty states and replace null checks.
• Type Conversions - Provides logic for transforming values between different functional container types to ensure type consistency.
• Value Unwrapping - Extracts the inner value from a container or propagates a specific error if the value is missing.
• Optional Value Wrapping - Encapsulates potentially null values in Optional containers to replace manual null checks with a chain of operations.
• Railway Oriented Programming - Implements railway oriented programming patterns to manage separate success and failure tracks.
• Side Effect Execution Encapsulation - Represents side effects as pure values in containers to separate the definition of an impure operation from its execution.
• Static Analysis Extensions - Extends the Mypy type checker to provide specialized validation for functional primitives and higher-kinded types.
• Error Handling - Captures success or failure outcomes in a type-safe container to avoid uncaught exceptions.
• Functional Type Validation - Uses a specialized Mypy plugin to validate higher-kinded types and functional pipeline consistency.
• Curried Function Type Validation - Provides static type validation for curried functions and partial applications to ensure type safety across invocation stages.
• Side Effect Isolation - Isolates impure operations within IO containers to separate side-effecting code from pure business logic.
• Absence Differentiation - Distinguishes between a present null value and the total absence of a value using distinct container states.
• Failure Value Mapping - Lifts functions to operate specifically on the failure value of a container while ignoring success.
• Async Await Patterns - Manages asynchronous computations in containers to handle event loop exceptions and reduce await boilerplate.
• Contextual Function Lifting - Transforms standard functions into versions that operate on wrapped values for seamless integration into functional pipelines.
• Custom Functional Containers - Allows the implementation of new type-safe containers by subtyping predefined functional interfaces.
• Empty State Fallbacks - Triggers a callback function only when a container is empty as a functional alternative to if-else blocks.
• Functional Interface Extension - Extends existing functional interfaces to build specialized data containers and new functional primitives.
• Function Chaining - Implements syntactic mechanisms to pass the output of one function as the input to the next in a pipeline.
• Function Lifting - Provides utilities to transform standard functions into compatible operations for use within functional pipelines.
• Transparent Async Composition - Wraps coroutines in containers to manipulate asynchronous logic within a synchronous context before execution.
• Pattern Matching - Uses structural pattern matching to execute different logic based on whether an impure operation succeeded or failed.
• Predicate Negations - Wraps predicate functions to invert their boolean return value.
• Pure Function Lifting - Transforms standard functions into compatible operations that can be composed with side-effect containers.
• Algebraic Law Specifications - Allows the formal specification of algebraic laws to ensure custom functional containers exhibit predictable behavior.
• Async Error Compositions - Wraps asynchronous functions in containers that capture exceptions as failure states to prevent program crashes.
• Async Computation Wrappers - Wraps asynchronous operations in a protective layer to simplify composition and prevent unexpected exceptions.
• Async Exception Containers - Wraps async operations in containers to prevent unhandled exceptions from crashing the event loop.
• Async Result Captures - Wraps asynchronous functions to catch exceptions and return them as type-safe result containers.
• Asynchronous Container Wrapping - Wraps coroutines in containers to allow non-blocking workflow composition without repetitive await statements.
• Asynchronous Operation Chaining - Links future results and handles exceptions in asynchronous call chains without repetitive wait statements.
• Compositional Transformation Pipelines - Chains sequential data transformations into a single executable pipeline to decouple logic from execution.
• Containerized Result Returns - Allows returning a specific container type based on a boolean expression as a declarative alternative to if-else statements.
• Containerized Function Application - Executes a function wrapped in a container against a value wrapped in another container, maintaining functional purity.
• Dependency-Injected Contexts - Provides mechanisms for sharing type-checked configuration state across a call chain using dependency injection.
• Failure to Success Lifting - Lifts functions that return containers to act on the failed state of another container to restore success.
• Error Type Compositions - Merges different error types from multiple operations into a single union type when chaining computations.
• Error Type Transformations - Lifts functions to operate on the error or failure state of a container without affecting the success value.
• Failure Recovery Strategies - Transforms failed computations into success states or provides fallback values via result container operations.
• Exception-to-Result Adapters - Transforms exception-throwing patterns into return-value-based error handling using result containers.
• Type-Safe Equality Enforcements - Provides compile-time enforcement of type-safe equality comparisons to prevent unintended comparisons between unrelated types.
• Success and Failure Partitioning - Separates a collection of containers into two distinct lists based on successful values and failures.
• Success State Detection - Provides mechanisms to check if a result container represents a successful operation.
• Branch Matching Functions - Executes specific logic based on whether a container is in a success or failure state to replace imperative branching.
• Imperative-to-Functional Bridges - Provides mechanisms to wrap the return values of standard imperative functions into functional containers.
• Explicit Dependency-Injection Wiring - Passes dependencies into functions using a type-safe, explicit mechanism to improve architectural readability.
• Iterable Container Aggregation - Combines collections of containers into a single container and fails the entire operation if any single element fails.
• Iterable Container Processing - Executes declarative loops over collections of containers to accumulate results while maintaining functional context.
• Asynchronous Pipelines - Models asynchronous interactions in a synchronous context to chain functions without requiring asynchronous callers.
• Monadic Async Bindings - Binds asynchronous functions to monadic containers to manage non-blocking computations.
• Result Fallback Extractions - Retrieves the inner value from a result container or provides a specified fallback upon failure.
• Container Flattening - Merges multiple layers of nested containers into a single level to simplify access to the wrapped value.
• Optional Return Wrappers - Provides decorators that automatically wrap the output of functions returning optional types into type-safe containers.
• IO Value Extractions - Allows extracting inner values from IO containers to maintain compatibility with non-functional imperative frameworks.
• Resource Acquisition and Release - Binds resource acquisition steps to guaranteed release actions to ensure the safe management of files and connections.
• Resource Lifecycle Management - Guarantees the acquisition and release of stateful resources to ensure proper cleanup after operations.
• Side Effect Discarding - Implements side-effect execution that can discard results to maintain the flow of the original value pipeline.
• Error Track Verifications - Verifies that failure paths in result containers are explicitly handled to prevent unhandled exceptions in pipelines.
• Exception-to-Container Conversions - Captures errors in a container instead of raising them to handle exceptions as data.
• Typed Error Management - Wraps dependency-dependent functions in containers that explicitly manage failure states using result types.
• Algebraic Law Verifications - Generates automated test cases to validate that custom functional containers adhere to formal algebraic laws.
• Result State Validators - Provides utilities for checking the success or failure status of a result container.
• Functional Programming - Implements type-safe monads and functional composition.
• Functional Utility Libraries - Facilitates safe, typed, and meaningful functional return values.
• General Utilities - Tools for type-safe and functional error handling.
• Type Extensions - Typed, safe functional programming primitives.

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