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item_015.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 15")
print("Example 1")
x = ["red", "orange", "yellow", "green", "blue", "purple"]
odds = x[::2] # 1, 3, 5번째 (인덱스로는 0, 2, 4)
evens = x[1::2] # 2, 4, 6번째 (인덱스로는 1, 3, 5)
print(odds)
print(evens)
print("Example 2")
x = b"mongoose"
y = x[::-1]
print(y)
print("Example 3")
x = "寿司" # 초밥(스시)를 뜻하는 일본어 한자
y = x[::-1]
print(y)
print("Example 4")
try:
w = "寿司"
x = w.encode("utf-8")
y = x[::-1]
z = y.decode("utf-8")
except:
logging.exception('이 예외가 발생해야 함')
else:
assert False
print("Example 5")
x = ["a", "b", "c", "d", "e", "f", "g", "h"]
x[::2] # ["a", "c", "e", "g"]
x[::-2] # ["h", "f", "d", "b"]
print(x[::2])
print(x[::-2])
print("Example 6")
x[2::2] # ["c", "e", "g"]
x[-2::-2] # ["g", "e", "c", "a"]
x[-2:2:-2] # ["g", "e"]
x[2:2:-2] # []
print(x[2::2])
print(x[-2::-2])
print(x[-2:2:-2])
print(x[2:2:-2])
print("Example 7")
y = x[::2] # ["a", "c", "e", "g"]
z = y[1:-1] # ["c", "e"]
print(x)
print(y)
print(z)
print("역주")
w = "abcZYX123"
x = w.encode("utf-8")
y = x[::-1]
z = y.decode("utf-8")
print(z)