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ϓϩάϥϚʔͬͯ
ͲΜͳਓ
ڇೕͱཛͰཧղ͢ΔϓϩάϥϚʔͱ͍͏ਓछ
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ͨͳ͔ͻͯ͞Δ
@tanakahisateru
ॴ
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͕ݴ͍·ͨ͠
ʮϋχʔɺࢢߦͬͯڇೕΛළͰ
ͭങ͖ͬͯͯɻ͠ཛ͕͋ͬͨΒ
͓ͭئ͍ʯ
ࢲͭͷڇೕළΛ࣋ͬͯؼ͖ͬͯ
·ͨ͠ɻ
൴ঁݴ͍·ͨ͠ʮͳΜͯ͜ͱɺͳ
ΜͰڇೕΛຊങ͖ͬͯͨͷ ʯ
ࢲݴ͍·ͨ͠ʮͩͬͯཛ͕͋ͬͨ
͔Βʯ
ϓϩάϥϚʔͱ
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from shop import Item, Shop
shop = Shop('ΠΦϯ υʔϜγςΟళ')
cart = shop.cart()
cart.add(Item.MILK)
receipt = shop.paycheck(cart)
print(receipt)
࣮ࡍʹ࡞ͬͯΈͨͷͰݕূ͠·͠ΐ͏
͓ళͷΧʔτʹΛೖΕͯࢧ͍Λ͢ΔͱϨγʔτ͕ग़·͢
IUUQTHJTUHJUIVCDPNUBOBLBIJTBUFSV
EGFDBBFGDCBGEE
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ڇೕύοΫ ... 1
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ʮͭങ͖ͬͯͯʯ
ΉΉɺ͜͜ʹͳΔ͔͠Εͳ͍ͧʜ
͍ɺສશΛظͯ͠Ͱ͍͍Α͏൚༻తʹ͓͔ͯ͠Ͷ
ϓϩάϥϚʔʹ͔͔Δͱ
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cart.add(Item.MILK)
cart.add(Item.MILK)
cart.add(Item.MILK)
cart.add(Item.MILK)
:
:
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for i in range(100):
cart.add(Item.MILK)
ϓϩάϥϚʔ͔͍͜͠ͷͰɺ܁Γฦ͠Λ͑·͢
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ʮڇೕΛʯʮ̍ͭʯ
ԿΛɺԿݸɺ͜ΕมΘΔ͔͠Εͳ͍ͳ
ϓϩάϥϚʔʹ͔͔Δͱ
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item = Item.MILK
count = 1
for i in range(count):
cart.add(item)
ϓϩάϥϚʔ͔͍͜͠ͷͰɺมΛ͑·͢
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ʮങ͖ͬͯͯʯ
ʮങ͏ʯखॱεςοϓ͕ଟ͍͔Β·ͱΊΑ͏
ͦͯ͠ʮങ͏ʯΛҙຯ͢Δ໊લ͚ͭͳ͖Ό
ϓϩάϥϚʔʹ͔͔Δͱ
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def buy(shop, item, count):
cart = shop.cart()
for i in range(count):
cart.add(item)
return shop.paycheck(cart)
item = Item.MILK
count = 1
receipt = buy(shop, item, count)
print(receipt)
ϓϩάϥϚʔ͔͍͜͠ͷͰɺؔΛ࡞Ε·͢
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ʮཛ͕͋ͬͨΒʯ
ϓϩάϥϚʔʹ͔͔Δͱ
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count = 1
# Ճ༷ ళʹཛ͕͋Δ߹ߪೖྔΛ 6 ͱ͢Δ
if shop.stock_of(Item.EGG) > 0:
count = 6
ϓϩάϥϚʔਓʹࢥΘΕ͍ͯΔ΄Ͳ࣮ࡍʹ
͔͘͜͠ͳ͍ͷͰɺ͙͢ʹʮ݅จʯΛཚ༻͠·͢
ͪͳΈʹʮ͋ͱͦΕ͔Β͜Εʯͱ࠷ޙʹݴΘΕͨ͜ͱಛʹΒ͔͠·͢
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ڇೕύοΫ ... 6
ʮͩͬͯཛ͕͔͋ͬͨΒʯ
͔ͯ͘͠ʜ
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from shop import Item, Shop
def buy(shop, item, count):
cart = shop.cart()
for i in range(count):
cart.add(item)
return shop.paycheck(cart)
shop = Shop('ΠΦϯ υʔϜγςΟళ')
item = Item.MILK
count = 1
# Ճ༷ ళʹཛ͕͋Δ߹ߪೖྔΛ 6 ͱ͢Δ
if shop.stock_of(Item.EGG) > 0:
count = 6
receipt = buy(shop, item, count)
print(receipt)
಄ͷମૢ
Ͳ͕͓͔͍͜͠Ͱ͠ΐ͏͔
ώϯτ͔͜͜ΒԼ
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ϓϩάϥϜ ࢥͬͨͱ͓Γʹಈ͔ͳ͍ɻॻ͍ͨͱ͓Γʹಈ͘ɻ
ϓϩάϥϚʔ ݴΘΕͨ͜ͱ͚ͩΛΕͱݴΘΕΔͱɺ
༩͑ΒΕͨϩδοΫؒҧ͍Λͦͷ··࠶ݱͯ͠͠·͏ɻ
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·ɺݴ͏ͯۃͳδϣʔΫͰ͔͢Β
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Ͱɺ͔͜͜Βઌ
ຊͷϓϩάϥϚʔͷͰ͢
ϓϩάϥϚʔͷΈͳ͞Μɺ͋ͳͨຊʹϓϩάϥϚʔͰ͠ΐ͏͔
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class Shopping:
def __init__(self, shop):
self.shop = shop
self.cart = shop.cart()
def take(self, item, count):
for i in range(count):
self.cart.add(item)
def paycheck(self):
return self.shop.paycheck(self.cart)
΄Μͱ͏ʹ͔͍͜͠ϓϩάϥϚʔ
ࢥߟΛิ͏ͨΊʹʮผͷ֓೦ʯΛͻͶΓग़͠·͢
࣮ࡏ͠ͳ͍ʮങ͍͢Δͱ͍͏͜ͱʯΛදݱͯ͠ΈΑ͏
ങ͍ͱ
ΛखʹऔΔ͜ͱ
ࢧ͏͜ͱ
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shop = Shop('ΠΦϯ υʔϜγςΟళ')
shopping = Shopping(shop)
shopping.take(Item.MILK, 1)
if shop.stock_of(Item.EGG) > 0:
shopping.take(Item.MILK, 6)
# FIXME ਖ਼͍͕͠Կ͔֬ೝͯ͠मਖ਼͢Δ͜ͱ
receipt = shopping.paycheck()
print(receipt)
ͦͷ֓೦ΛͬͯʮจষͷΑ͏ʹॻ͘ʯͱɺ
ύζϧͷ··Ͱݟ͑ͳ͔ͬͨʮؾ͖ͮʯ͕͋Γ·͢
͋Ε ͜͜ͷࢦఆ͕ཁΔͧ
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shopping = Shopping(shop)
shopping.take(Item.MILK, 1)
if shop.stock_of(Item.EGG) > 0:
shopping.take(Item.EGG, 6)
ʮಡΊΔʯίʔυ͙͢ʹͳ͓ͤ·͢
ཛ͕͋ͬͨͱ͖ങͬͯཉ͍͠ͷɺڇೕ͡Όͳͯ͘ී௨ཛͰ͠ΐ
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ڇೕύοΫ ... 1
ཛ ... 6
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͓ͬͱɺ
͜ΕͰऴΘΓ͔ͳͱࢥͬͨ
ͦΜͳΘ͚ͳ͍͡Όͳ͍Ͱ͔͢ɺ
·ͩϠό͍༷࿙Ε͕͋Γ·͢Α
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ڇೕύοΫ ... 1
ཛ ... 6
shop = Shop('ΠΦϯ υʔϜγςΟళ')
shop.stocks(Item.EGG, 100)
;ͭ͏ϓϩάϥϚʔɺཛ͕ेʹ͋Δ߹Λςετ͠·͢
ళʹԿࡏݿ͕͋Δ͔એݴ
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ڇೕύοΫ ... 1
shop = Shop('ΠΦϯ υʔϜγςΟళ')
shop.stocks(Item.EGG, 0)
͔͍͜͠ϓϩάϥϚʔɺཛ͕ͳ͍߹ςετ͠·͢
ళͷࡏݿΛʹͯ͠ΈΔ
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shop = Shop('ΠΦϯ υʔϜγςΟళ')
shop.stocks(Item.EGG, 5)
if shop.stock_of(Item.EGG) > 0:
shopping.take(Item.EGG, 6)
͋Ε ཛͷࡏݿ͕ΑΓগͳ͍ͱʜ
ͬͱ͔͍͜͠ϓϩάϥϚʔɺςετ͔ΒϩδοΫΛൃݟ͠·͢
ͭ͋ΔͷΛ
ͭͰ͋Ε
ͭങ͏
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shop = Shop('ΠΦϯ υʔϜγςΟళ')
shop.stocks(Item.MILK, 0)
shopping.take(Item.MILK, 1)
ͦͦɺࡏݿ͋Δ͔Θ͔Βͳ͍ͷʹɺ
ແ݅ʹڇೕΛങ͓͏ͱͯ͠Δ͚Ͳʜ
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$ python main.py
Traceback (most recent call last):
File "main.py", line 43, in
shopping.take(Item.EGG, 6)
File "main.py", line 30, in take
self.cart.add(item)
File “/.../shop.py”, line 19, in add
raise Exception("%sͷࡏݿ͕͋Γ·ͤΜ" % item.value)
Exception: ཛͷࡏݿ͕͋Γ·ͤΜ
ίʔυؒҧͬͯͳͯ͘ɺ͓͔͠ͳϩδοΫͩͱɺ
࣮ߦͨ͠ͱ͖Τϥʔ͕ग़·͢
ʮ͏ΘɺͳΜ͔Ϡόͦ͏ͳͷग़ΔΜʯ
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# FIXME ༷όά: 1 ͭͰߪೖ͢Δʹࡏݿ͕ඞཁ
shopping.take(Item.MILK, 1)
# FIXME ࡏݿ͕ 1 ʙ 5 ͷͱ͖ΤϥʔͰམͪΔ
if shop.stock_of(Item.EGG) > 0:
shopping.take(Item.EGG, 6)
ࡏݿ͕Γͳ͍ͱ͖ߪೖͨ͠Βࢮ͵͍
ແ݅ʹͭങ͖ͬͯͯͱ͔ɺͳΜͯةݥͳ༷ͳΜͩ
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# ߪೖ͢Δʹࡏݿ͕ඞཁ [hotfix]
if shop.stock_of(Item.MILK) >= 1:
shopping.take(Item.MILK, 1)
# 6 ͭߪೖ͢Δʹ 6 Ҏ্ͷࡏݿ͕ඞཁ [hotfix]
if shop.stock_of(Item.EGG) >= 6:
shopping.take(Item.EGG, 6)
ͬͯͳײ͡Ͱ߄ͯΔͱΖ͘ͳ͜ͱΛ͠·ͤΜ
͔͘͜͠ͳ͍ͷͰ݅จΛʜ
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ແ
shop.stocks(Item.EGG, 5)
shop.stocks(Item.MILK, 0)
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ʮڇೕͳ͔ͬͨ ͠ΐ͏͕ͳ͍ɺΘ͔Δɻ
Ͱ͞ɺͳΜͰཛ͋ͬͨ͜ΜͳΒɺ
͋Δ͚ͩങͬͯདྷͳ͔ͬͨͷ ʯ
ʮͭങ͑ͳ͍͔Βɺ͔ͳʯ
ΘΓͱϦΞϧʹ͜͏͍͏ϛεى͖·͢
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stock = shop.stock_of(Item.EGG)
if stock > 0:
if stock < 6:
shopping.take(Item.EGG, stock)
else:
shopping.take(Item.EGG, 6)
͋Δͱ͖͚ͩങͬͯɺͳ͍ͱ͖ങͬͪΌμϝͰʜ
ࡏݿ͕ΑΓগͳ͍ͳΒࡏݿͿΜ͚ͩങͬͯ
ͦ͏͡Όͳ͔ͬͨΒങͬͯʜ
͜Ε͕ڇೕͱཛʹରͯ͠ඞཁͰʜ
͜͏ͳͬͯ͠·͏ͱటপͰ͢
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class Shopping:
def wants(self, item, wanted):
stock = shop.stock_of(item)
if stock < 1:
# ࡏݿ͕ͻͱͭͳ͚ΕखʹऔΕͳ͍
pass
elif stock < wanted:
# ࡏݿ͕ཉ͍͠ྔΑΓগͳ͍ͱ͖ࡏݿͰզຫ͢Δ
self.take(item, stock)
else:
# ࡏݿʹ͕ͳ͚Εཉ͍͚ͩ͠ߪೖͰ͖Δ
self.take(item, wanted)
ͦΜͳෳࡶͳهड़Λɺཁ͢ΔʹʮԿ͕Կݸཉ͍͠ͷ͔ʯͱ
ݴ͍͑ΒΕΔΑ͏ʹ͢ΔͳͲ͍ͯ͘͠ͱ
shopping.wants(Item.EGG, 6) ཛͭཉ͍͠Ͱ͢
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buyer = Buyer(shop)
buyer.wants(Item.MILK, 1)
buyer.purchase()
class Buyer:
def wants(self, item, wanted):
...
def purchase(self):
...
ʮΛཉ͍͠ʯͱࢥ͏ͷʮߪೖऀʯͩ͠
ʮߪೖऀʯͷ͢Δ͜ͱʮߪങʯͩΑͶ
ʜͱɺ࡞ͬͨ֓೦͕ͩΜͩΜɺݱ࣮Λͨ͠ײ͡ʹۙ͘ͳΓ·͢
ߪೖऀ
ڇೕΛͻͱͭཉ͍͠ͱݴͬͯ
ۚΛͬͨ
໊લΛม͑ͯΈͨ
໊લΛม͑ͯΈͨ
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shop = Shop('ΠΦϯ υʔϜγςΟళ')
shop.stocks(Item.MILK, 0)
shop.stocks(Item.EGG, 5)
buyer = Buyer(shop)
buyer.wants(Item.MILK, 1)
buyer.wants(Item.EGG, 6)
receipt = buyer.purchase()
print(receipt)
ຊͷϓϩάϥϚʔͷॻ͘ίʔυɺ
ෳࡶ͗ͯ͢ී௨ͷਓ͕ಡΊͳ͍ຐ๏ͷΑ͏ͳͷͰͳͯ͘ɺ
Ұݟ୭Ͱॻ͚ΔΜ͡Όͳ͍͔ͱࢥ͑ͯ͠·͏΄Ͳ؆୯ʹͳΓ·͢
୭Ͱॻ͚ͦ͏ͳͷʹຌਓʹͰ͖ͳ͍ɺ
ͱ͍͏Ͱચ࿅͞ΕͨσβΠϯͱࣅ͍ͯ·͢
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ങ͖ͬͯͯཉ͍͠ͷ
ڇೕύοΫʜ
ཛʜ
Γͳͯ͘ళʹ͋ΔͰ͍͍Α—
ຊͷϓϩάϥϚʔ͕ٻΊΔ༷ɺ
ʮʙͨΒʯͷखॱͰͳͯ͘ɺͰ؆ܿͳʮཁٻʯͰ͢ɻ
ίʔυΛॻ͍ͯؾ͚ͮͳ͍ਓ͕ߟ͑ͨϩδοΫͳΜͯɺͲ͏ͤ࿙Ε͕͋ΔͷͰ
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ͦͷཁٻͱ࣮ίʔυɺ
ݴޠ͕ҧ͏͚ͩͷɺ
ҙຯ͕ಉ͡จষʹͳΔͷ͕ཧͰ͢
ڇೕύοΫʜ
ཛʜ
buyer.wants(Item.MILK, 1)
buyer.wants(Item.EGG, 6)
པΉਓͷͱϓϩάϥϜͱɺͦͷઌೖ؍ʹͯ͠ɺ
૬ޓʹ࡞༻͢Δ Α͏ʹΊΔ͖
ͷͳͷͰ͢
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ຊͷϓϩάϥϚʔʹʮݴΘΕͨͱ͓Γʹ࡞ͬͯʯͱ
Ұํతʹݴ͍͚ͬͯ·ͤΜɻ
ຊͷϓϩάϥϚʔͱɺରΛ௨ͯ͡
ʮཔΈࣄͷݴ͍ํΛमਖ਼ʯ͍͖ͯ͠·͢ɻ
ཧղ͠߹͏͜ͱ͕࠷ྑͷ݁ՌΛͨΒ͠·͢ɻ
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shop = Shop('ΠΦϯ υʔϜγςΟళ')
shop.stocks(Item.MILK, 0)
shop.stocks(Item.EGG, 5)
buyer = Buyer(shop)
buyer.wants(Item.MILK, 1)
buyer.wants(Item.EGG, 6)
receipt = buyer.purchase()
print(receipt)
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$ python main.py ⏎
ΠΦϯ υʔϜγςΟళ Ͱͷ͓ങ্͍͛:
ཛ ... 5
͕ٻΊ͍ͯͨങ͍
ʮ͝ΊΜڇೕͳ͔͚ͬͨͲɺཛͳΜͱ͔ͭͬͯͨΑʯ
ʮؾ͕ར͘ΘͶʯ
ΊͰͨ͠ΊͰͨ͠