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item_043.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 43")
print("Example 1")
def index_words(text):
result = []
if text:
result.append(0)
for index, letter in enumerate(text):
if letter == " ":
result.append(index + 1)
return result
print("Example 2")
address = "여든 하고도 일곱 해 전..."
result = index_words(address)
print(result[:10])
print("Example 3")
def index_words_iter(text):
if text:
yield 0
for index, letter in enumerate(text):
if letter == " ":
yield index + 1
print("Example 4")
it = index_words_iter(address)
print(next(it))
print(next(it))
print("Example 5")
result = list(index_words_iter(address))
print(result[:10])
print("Example 6")
def index_file(handle):
offset = 0
for line in handle:
if line:
yield offset
for letter in line:
offset += 1
if letter == " ":
yield offset
print("Example 7")
address_lines = """여든 하고도 일곱 해 전,
우리의 선조들은 자유속에 잉태된 나라,
모든 사람은 평등하다는 믿음에 바쳐진
새 나라를 이 대륙에 낳았습니다."""
with open("address.txt", "w") as f:
f.write(address_lines)
import itertools
with open("address.txt", "r") as f:
it = index_file(f)
results = itertools.islice(it, 0, 10)
print(list(results))