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item_034.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 34")
print("Example 1")
def log(message, values):
if not values:
print(message)
else:
values_str = ", ".join(str(x) for x in values)
print(f"{message}: {values_str}")
log("내 숫자들", [1, 2])
log("안녕", [])
print("Example 2")
def log(message, *values): # 변경함
if not values:
print(message)
else:
values_str = ", ".join(str(x) for x in values)
print(f"{message}: {values_str}")
log("내 숫자들", 1, 2)
log("안녕") # 변경함
print("Example 3")
favorites = [7, 33, 99]
log("좋아하는 숫자들", *favorites)
print("Example 4")
def my_generator():
for i in range(10):
yield i
def my_func(*args):
print(args)
it = my_generator()
my_func(*it)
print("Example 5")
def log_seq(sequence, message, *values):
if not values:
print(f"{sequence} - {message}")
else:
values_str = ", ".join(str(x) for x in values)
print(f"{sequence} - {message}: {values_str}")
log(1, "좋아하는 숫자들", 7, 33) # 새 코드, 가변 인자 사용. 문제 없음
log(1, "안녕") # 새 코드, 메시지만 사용. 문제 없음
log_seq("좋아하는 숫자들", 7, 33) # 예전 사용법, 코드 깨짐