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item_013.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 13")
print("Example 1")
my_test1 = "hello" "아름다운" "world"
my_test2 = "hello" + "아름다운" + "world"
assert my_test1 == my_test2
print("Example 2")
x = 1
my_test1 = (
r"첫번째 \ 부분은 이스케이프(escapes)가 있음\n, "
f"여기서는 문자열 인터폴레이션 {x}이 들어있음, "
'여기에는 "큰 따옴표" 문자열이 들어있음'
)
print(my_test1)
print("Example 3")
y = 2
my_test2 = r"fir\st" f"{y}" '"third"'
print(my_test2)
print("Example 4")
my_test3 = r"fir\st", f"{y}" '"third"'
print(my_test3)
print("Example 5")
my_test4 = [
"first line\n",
"두번째 줄\n",
"third line\n",
]
print(my_test4)
print("Example 6")
my_test5 = [
"first line\n",
"두번째 줄\n" # 쉼표를 제거함
"third line\n",
]
print(my_test5)
print("Example 7")
my_test5 = [
"first line\n",
"두번째 줄\n" "third line\n",
]
print("Example 8")
my_test6 = [
"first line\n",
"두번째 줄\n" + # 명시적 결합
"third line\n",
]
assert my_test5 == my_test6
print("Example 9")
my_test6 = [
"first line\n",
"두번째 줄\n" + "third line\n",
]
print("Example 10")
print("this is my long message(긴 메시지) "
"that should be printed out")
print("Example 11")
import sys
print("this is my long message(긴 메시지) "
"that should be printed out",
end="",
file=sys.stderr)
print("Example 12")
import sys
first_value = ...
second_value = ...
class MyData:
def __init__(self, *args, **kwargs):
self.args = args
self.kwargs = kwargs
value = MyData(123,
first_value,
f"my format string {x}"
f"다른 값 {y}",
"and here is more text",
second_value,
stream=sys.stderr)
print("Example 13")
value2 = MyData(123,
first_value,
f"my format string {x}" + # 명시적 연결
f"다른 값 {y}",
"and here is more text",
second_value,
stream=sys.stderr)