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소스 코드 등록
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‎Chapter1/Better way1.py

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###
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### 아이템 1
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###
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import sys
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print(sys.version_info)
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print(sys.version)

‎Chapter1/Better way10.py

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###
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### 아이템 10
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###
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fresh_fruit = {
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'사과': 10,
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'바나나': 8,
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'레몬': 5,
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}
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def make_lemonade(count):
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n = 1
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print(f'레몬 {count*n} 개로 레모네이드 {count//n} 개를 만듭니다.')
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fresh_fruit['레몬'] -= (count * n)
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print(f'레몬이 {fresh_fruit["레몬"]} 개 남았습니다.')
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def out_of_stock():
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print(f'제료가 부족합니다. 재료를 보충해 주세요.')
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count = fresh_fruit.get('레몬', 0)
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if count:
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make_lemonade(count)
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else:
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out_of_stock()
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fresh_fruit['레몬'] = 5 # 테스트를 위해 갯수 리셋
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if count := fresh_fruit.get('lemon', 0):
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make_lemonade(count)
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else:
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out_of_stock()
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def make_cider(count):
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n = 4
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print(f'사과 {count} 개로 사과주스 {count//n} 개를 만듭니다.')
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fresh_fruit['사과'] -= (n *(count//n))
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print(f'사과가 {fresh_fruit["사과"]} 개 남았습니다.')
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fresh_fruit['사과'] = 10 # 테스트를 위해 갯수 리셋
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count = fresh_fruit.get('사과', 0)
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if count >= 4:
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make_cider(count)
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else:
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out_of_stock()
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fresh_fruit['사과'] = 10 # 테스트를 위해 갯수 리셋
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if (count := fresh_fruit.get('사과', 0)) >= 4:
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make_cider(count)
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else:
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out_of_stock()
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def slice_bananas(count):
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print(f'바나나 {count} 개를 슬라이스합니다.')
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fresh_fruit['바나나'] -= count
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return count
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class OutOfBananas(Exception):
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pass
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def make_smoothies(count):
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n=2
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if count > n:
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print(f'바나나 슬라이스 {count} 개로 스무디 {count//n} 개를 만듭니다.')
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print(f'바나나가 {fresh_fruit["바나나"]} 개 남았습니다.')
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else:
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raise OutOfBananas
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pieces = 0
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count = fresh_fruit.get('바나나', 0)
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if count >= 2:
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pieces = slice_bananas(count)
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try:
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smoothies = make_smoothies(pieces)
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except OutOfBananas:
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out_of_stock()
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fresh_fruit['바나나'] = 8 # 테스트를 위해 갯수 리셋
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count = fresh_fruit.get('바나나', 0)
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if count >= 2:
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pieces = slice_bananas(count)
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else:
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pieces = 0
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fresh_fruit['바나나'] = 8 # 테스트를 위해 갯수 리셋
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pieces = 0
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if (count := fresh_fruit.get('바나나', 0)) >= 2:
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pieces = slice_bananas(count)
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try:
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smoothies = make_smoothies(pieces)
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except OutOfBananas:
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out_of_stock()
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fresh_fruit['바나나'] = 8 # 테스트를 위해 갯수 리셋
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if (count := fresh_fruit.get('바나나', 0)) >= 2:
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pieces = slice_bananas(count)
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else:
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pieces = 0
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try:
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smoothies = make_smoothies(pieces)
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except OutOfBananas:
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out_of_stock()
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count = fresh_fruit.get('banana', 0)
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fresh_fruit['바나나'] = 8 # 테스트를 위해 갯수 리셋
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if count >= 2:
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pieces = slice_bananas(count)
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to_enjoy = make_smoothies(pieces)
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else:
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count = fresh_fruit.get('사과', 0)
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if count >= 4:
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to_enjoy = make_cider(count)
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else:
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count = fresh_fruit.get('레몬', 0)
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if count:
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to_enjoy = make_lemonade(count)
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else:
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to_enjoy = '아무것도 없음'
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if (count := fresh_fruit.get('바나나', 0)) >= 2:
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pieces = slice_bananas(count)
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to_enjoy = make_smoothies(pieces)
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elif (count := fresh_fruit.get('사과', 0)) >= 4:
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to_enjoy = make_cider(count)
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elif count := fresh_fruit.get('레몬', 0):
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to_enjoy = make_lemonade(count)
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else:
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to_enjoy = '아무것도 없음'
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import random
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def pick_fruit():
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if random.randint(1,10) > 2: # 80% 확률로 새 과일 보충
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return {
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'사과': random.randint(0,10),
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'바나나': random.randint(0,10),
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'레몬': random.randint(0,10),
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}
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else:
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return None
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def make_juice(fruit, count):
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if fruit == '사과':
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return [('사과주스', count/4)]
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elif fruit == '바나나':
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return [('바나나스무디',count/2)]
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elif fruit == '레몬':
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return [('레모네이드',count/1)]
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else:
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return []
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bottles = []
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fresh_fruit = pick_fruit()
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while fresh_fruit:
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for fruit, count in fresh_fruit.items():
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batch = make_juice(fruit, count)
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bottles.extend(batch)
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fresh_fruit = pick_fruit()
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print(bottles)
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bottles = []
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while True: # 무한루프
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fresh_fruit = pick_fruit()
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if not fresh_fruit: # 중간에서 끝내기
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break
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for fruit, count in fresh_fruit.items():
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batch = make_juice(fruit, count)
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bottles.extend(batch)
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print(bottles)
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bottles = []
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while fresh_fruit := pick_fruit():
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for fruit, count in fresh_fruit.items():
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batch = make_juice(fruit, count)
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bottles.extend(batch)
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print(bottles)

‎Chapter1/Better way3.py

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###
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### 아이템 3
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###
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a = b'h\x65llo'
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print(list(a))
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print(a)
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a = 'a\u0300 propos'
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print(list(a))
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print(a)
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def to_str(bytes_or_str):
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if isinstance(bytes_or_str, bytes):
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value = bytes_or_str.decode('utf-8')
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else:
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value = bytes_or_str
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return value # str 인스턴스
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print(repr(to_str(b'foo')))
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print(repr(to_str('bar')))
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print(repr(to_str(b'\xed\x95\x9c'))) # UTF-8에서 한글은 3바이트임
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def to_bytes(bytes_or_str):
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if isinstance(bytes_or_str, str):
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value = bytes_or_str.encode('utf-8')
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else:
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value = bytes_or_str
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return value # bytes 인스턴스
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print(repr(to_bytes(b'foo')))
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print(repr(to_bytes('bar')))
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print(repr(to_bytes('한글')))
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print(b'one' + b'two')
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print('one' + 'two')
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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# b'one' + 'two' # TypeError
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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# 'one' + b'two' # TypeError
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assert b'red' > b'blue'
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assert 'red' > 'blue'
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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# assert 'red' > b'blue' # TypeError
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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#assert b'blue' < 'red' # TypeError
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print(b'foo' == 'foo') # 항상 false
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print(b'red %s' % b'blue') # 타입이 같은 형식화문자열 사용
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print('red %s' % 'blue')
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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#print(b'red %s' % 'blue') # TypeError
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print('red %s' % b'blue') # 생각과 다르게 작동
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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#with open('data.bin', 'w') as f: # TypeError
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# f.write(b'\xf1\xf2\xf3\xf4\xf5')
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with open('data.bin', 'wb') as f:
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f.write(b'\xf1\xf2\xf3\xf4\xf5')
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# 오류가 나는 부분. 오류를 보고 싶으면 커멘트를 해제할것
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#with open('data.bin', 'r') as f: # UnicodeDecodeError
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# data = f.read()
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with open('data.bin', 'rb') as f:
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data = f.read()
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with open('data.bin', 'r', encoding='cp1252') as f:
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data = f.read()
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assert data == 'ñòóôõ'
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# 시스템 인코딩 검사: python3 -c 'import locale; print(locale.getpreferredencoding())'

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