Rich iterator for Python 3
Project description
iter2
This library provides implementation of rich-iterator concept, inspired by Rust's std::iter::Iterator, Java's Stream and more-itertools library.
The original purpose of this tool was to be used within a REPL (primarily IPython) environment for processing streaming data.
The goal of v2.x
is to build upon the 7 years of experience gained from the production use of v1.x
, to factor out redundant functionality, and to create a well-typed public API.
Usage
iter2
- the main API of this library, behaves like builtin iter
but creates an instance of iter2.interfaces.Iterator2
.
iter2.interfaces
- module with library specific interfaces like Iterator2
and Iterable2
.
iter2.algo
- module with all algorithms and their curried versions.
iter2.op
- module with useful operators like nth_item
, pipe
and mapping_items
.
iter2.box
and iter2.option
- modules with types of "boxed values" Box2
and Option2
.
import typing as tp
from iter2 import iter2
DATA: tp.Sequence[tp.Tuple[str, int | float]] = ... # type: ignore
result: float | complex = (
iter2(DATA)
.filter_unpacked(lambda title, _: (
title.startswith('Static typing')
)) # Iterator2[tp.Tuple[str, int | float]]
.map_unpacked(lambda _, value: (
-value,
)) # Iterator2[int | float]
.filter_by_type(float) # Iterator2[float]
.apply_raw(
iter2.algo.find_max_value
) # Option2[float]
.value_or_else(lambda: 31337j) # float | complex
)
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