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# coding:utf-8
import itertools
from typing import Any, Callable, Generator, Iterable, Optional, Union
def expo(
base: float = 2,
factor: float = 1,
max_value: Optional[float] = None
) -> Generator[float, Any, None]:
"""Generator for exponential decay.
Args:
base: The mathematical base of the exponentiation operation
factor: Factor to multiply the exponentiation by.
max_value: The maximum value to yield. Once the value in the
true exponential sequence exceeds this, the value
of max_value will forever after be yielded.
"""
# Advance past initial .send() call
yield # type: ignore[misc]
n = 0
while True:
a = factor * base ** n
if max_value is None or a < max_value:
yield a
n += 1
else:
yield max_value
def fibo(max_value: Optional[int] = None) -> Generator[int, None, None]:
"""Generator for fibonaccial decay.
Args:
max_value: The maximum value to yield. Once the value in the
true fibonacci sequence exceeds this, the value
of max_value will forever after be yielded.
"""
# Advance past initial .send() call
yield # type: ignore[misc]
a = 1
b = 1
while True:
if max_value is None or a < max_value:
yield a
a, b = b, a + b
else:
yield max_value
def constant(
interval: Union[int, Iterable[float]] = 1
) -> Generator[float, None, None]:
"""Generator for constant intervals.
Args:
interval: A constant value to yield or an iterable of such values.
"""
# Advance past initial .send() call
yield # type: ignore[misc]
try:
itr = iter(interval) # type: ignore
except TypeError:
itr = itertools.repeat(interval) # type: ignore
for val in itr:
yield val
def runtime(
*,
value: Callable[[Any], float]
) -> Generator[float, None, None]:
"""Generator that is based on parsing the return value or thrown
exception of the decorated method
Args:
value: a callable which takes as input the decorated
function's return value or thrown exception and
determines how long to wait
"""
ret_or_exc = yield # type: ignore[misc]
while True:
ret_or_exc = yield value(ret_or_exc)
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