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item_019.py
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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 19")
print("Example 1")
for i in range(3):
print("Loop", i)
else:
print("Else 블록!")
print("Example 2")
for i in range(3):
print("Loop", i)
if i == 1:
break
else:
print("Else 블록!")
print("Example 3")
for x in []:
print("이 줄은 실행되지 않음")
else:
print("For의 Else 블록!")
print("Example 4")
while False:
print("이 줄은 실행되지 않음")
else:
print("While의 Else 블록!")
print("Example 5")
a = 4
b = 9
for i in range(2, min(a, b) + 1):
print("체크:", i)
if a % i == 0 and b % i == 0:
print("서로소 아님")
break
else:
print("서로소")
print("Example 6")
def coprime(a, b):
for i in range(2, min(a, b) + 1):
if a % i == 0 and b % i == 0:
return False
return True
assert coprime(4, 9)
assert not coprime(3, 6)
print("Example 7")
def coprime_alternate(a, b):
is_coprime = True
for i in range(2, min(a, b) + 1):
if a % i == 0 and b % i == 0:
is_coprime = False
break
return is_coprime
assert coprime_alternate(4, 9)
assert not coprime_alternate(3, 6)