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#! /usr/bin/env python3
#  lsimports.py - List imported modules of Python projects.
#
#  Copyright (C) 2020 Richard Neumann <mail at richard dash neumann period de>
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""Coroutine-based two-in-one decorator."""

from contextlib import suppress
from functools import wraps
from math import pi, sqrt
from typing import Callable


def coroproperty(method: Callable) -> property:
    """Single decorator for getter and setter methods."""

    @wraps(method)
    def getter(self):
        """Property setter function."""
        coro = method(self)
        value = next(coro)
        coro.close()
        return value

    @wraps(method)
    def setter(self, value):
        """Property getter function."""
        coro = method(self)
        next(coro)
        next(coro)

        with suppress(StopIteration):
            coro.send(value)

    return property(getter, setter)


class Circle:
    """Information about a circle."""

    def __init__(self, radius: float):
        """Initializes the circle with its radius."""
        self.radius = radius

    @coroproperty
    def diameter(self):
        """Gets and sets the diameter."""
        yield self.radius * 2
        self.radius = (yield) / 2

    @coroproperty
    def circumference(self):
        """Gets and sets the circumference."""
        yield self.diameter * pi
        self.diameter = (yield) / pi

    @coroproperty
    def area(self):
        """Gets and sets the area."""
        yield pow(self.radius, 2) * pi
        self.radius = sqrt((yield) / pi)


if __name__ == '__main__':
    circle = Circle(42)

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Coro get: 0.2394869327545166
Classic get: 0.09408378601074219
Ratio coro / classic: 2.5454644515174247
Coro set: 0.7087152004241943
Classic set: 0.10921454429626465
Ratio coro / classic: 6.489201644257868