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item_046.py
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executable file
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#!/usr/bin/env PYTHONHASHSEED=1234 python3
# Copyright 2014-2024 Brett Slatkin, Pearson Education Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
### 책 예제에 맞는 환경 설정을 시작함
import random
random.seed(1234)
import logging
from pprint import pprint
from sys import stdout as STDOUT
# 모든 출력을 임시 디렉터리로 보냄
import atexit
import gc
import io
import os
import tempfile
TEST_DIR = tempfile.TemporaryDirectory()
atexit.register(TEST_DIR.cleanup)
# 윈도우에서 프로세스가 제대로 종료되도록 함
OLD_CWD = os.getcwd()
atexit.register(lambda: os.chdir(OLD_CWD))
os.chdir(TEST_DIR.name)
def close_open_files():
everything = gc.get_objects()
for obj in everything:
if isinstance(obj, io.IOBase):
obj.close()
atexit.register(close_open_files)
### 책 예제에 맞는 환경설정 끝
print("아이템 46")
print("Example 1")
import math
def wave(amplitude, steps):
step_size = 2 * math.pi / steps
for step in range(steps):
radians = step * step_size
fraction = math.sin(radians)
output = amplitude * fraction
yield output
print("Example 2")
def transmit(output):
if output is None:
print(f"출력: 없음")
else:
print(f"출력: {output:>5.1f}")
def run(it):
for output in it:
transmit(output)
run(wave(3.0, 8))
print("Example 3")
def my_generator():
received = yield 1
print(f"{received=}")
it = my_generator()
output = next(it) # 첫 번째 제너레이터 출력을 얻는다
print(f"{output=}")
try:
next(it) # 종료될 때까지 제너레이터를 실행한다
except StopIteration:
pass
else:
assert False
print("Example 4")
it = my_generator()
output = it.send(None) # 첫 번째 제너레이터 출력을 얻는다
print(f"{output=}")
try:
it.send("안녕하세요!") # 값을 제너레이터에 보낸다
except StopIteration:
pass
else:
assert False
print("Example 5")
def wave_modulating(steps):
step_size = 2 * math.pi / steps
amplitude = yield # 초기 진폭을 받는다
for step in range(steps):
radians = step * step_size
fraction = math.sin(radians)
output = amplitude * fraction
amplitude = yield output # 다음 진폭을 받는다
print("Example 6")
def run_modulating(it):
amplitudes = [None, 7, 7, 7, 2, 2, 2, 2, 10, 10, 10, 10, 10]
for amplitude in amplitudes:
output = it.send(amplitude)
transmit(output)
run_modulating(wave_modulating(12))
print("Example 7")
def complex_wave():
yield from wave(7.0, 3)
yield from wave(2.0, 4)
yield from wave(10.0, 5)
run(complex_wave())
print("Example 8")
def complex_wave_modulating():
yield from wave_modulating(3)
yield from wave_modulating(4)
yield from wave_modulating(5)
run_modulating(complex_wave_modulating())
print("Example 9")
def wave_cascading(amplitude_it, steps):
step_size = 2 * math.pi / steps
for step in range(steps):
radians = step * step_size
fraction = math.sin(radians)
amplitude = next(amplitude_it) # 다음 입력을 받는다
output = amplitude * fraction
yield output
print("Example 10")
def complex_wave_cascading(amplitude_it):
yield from wave_cascading(amplitude_it, 3)
yield from wave_cascading(amplitude_it, 4)
yield from wave_cascading(amplitude_it, 5)
print("Example 11")
def run_cascading():
amplitudes = [7, 7, 7, 2, 2, 2, 2, 10, 10, 10, 10, 10]
it = complex_wave_cascading(iter(amplitudes)) # 이터레이터를 전달한다
for amplitude in amplitudes:
output = next(it)
transmit(output)
run_cascading()