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pythonでメタプログラミング(メタクラス編)
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Daiki Ikeshima
March 25, 2021
Programming
590
1
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pythonでメタプログラミング(メタクラス編)
Daiki Ikeshima
March 25, 2021
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Transcript
QZUIPOͰϝλϓϩάϥϛϯά dϝλΫϥεd UFDIUBML "*νʔϜౢେथ
ϝλϓϩάϥϛϯάͱʁ w ίʔυΛੜ͢ΔΑ͏ͳϓϩάϥϛϯάͷ͜ͱ w ίʔυΛʮϝλతʯʹ࡞Δ
ͳͥϝλϓϩάϥϛϯά͢Δͷ͔ʁ w Ϋϥεੜ࣌ͷৼΔ͍ͳͲಛघͳ੍ޚ͕Ͱ͖Δ w ؆୯ʹ͔͚ΔΑ͏ʹͳΔ ͨͩ͠ɺଟ༻͢ΔͱෳࡶʹͳΓ͗͢ΔͷͰɺ w දग़͢Δ෦Ͱଟ༻͠ͳ͍ w ϥΠϒϥϦͱ͔Ͱྑͦ͞͏
QZUIPOͰϝλϓϩάϥϛϯάྫ ͍ΖΜͳύλʔϯ͕͋Δ w ϝλΫϥεΫϥεͷ࡞ΓํΛنఆ w σίϨʔλϝιουΛϥοϓ͢Δ w σΟεΫϦϓλ@@HFU@@ ͱ͔͕࣮͞Ε͍ͯΔΫϥ εɻ!DMBTTNFUIPE
!TUBUJDNFUIPEͷ࣮Ͱ༗໊ w ͳͲͳͲ σίϨʔλ σΟεΫϦϓλΛ࣮ͬͯͨ͠ TUBUJDNFUIPEͷٖࣅίʔυ
ΫϥεͷΠϯελϯε࡞ w @@OFX@@ @@JOJU@@ ͱ͍͏ॱͰಛघϝιου͕ݺΕΔ w @@OFX@@ DMT Πϯελϯε͕Ͱ͖Δલʹ࣮ߦɻΫϥεΛΠϯελϯεԽ͢Δɻ w
@@JOJU@@ TFMG Πϯελϯε͕Ͱ͖ͨޙʹ࣮ߦɻΠϯελϯεΛॳظԽ͢Δɻ w @@OFX@@ Λ࣮ߦޙΠϯελϯε͕ฦΔͱɺͦͷ@@JOJU@@ Λ࣮ߦ͢Δ༷ Ϋϥε4BNQMF$MBTT͔ΒΠϯελϯεTFMGΛ࡞ ΠϯελϯεTFMGΛॳظԽ ΠϯελϯεTFMGΛฦ͢
ϝλΫϥεͱʁ w ϝλΫϥεɿΫϥεΛ࡞ΔΫϥεͷ͜ͱ w ࢦఆ͢Δ͜ͱͰΫϥε࡞࣌ͷৼΔ͍Λ੍ޚͰ͖Δ w ΫϥεͲ͏ͬͯ࡞͞Ε͍ͯΔͷ͔ʁʁʁ 4BNQMF$MBTT͕DMTʹͳΔ 4BNQMF.FUB$MBTTͰDMTΛ࡞
ΫϥεΛ࡞ΔɿUZQF UZQF ʮΦϒδΣΫτͷܕΛΓ͍ͨͱ͖ʯʹ ͏ϝιουͱͯ͠༗໊ ͏̍ͭͷ͍ํΫϥεΛ࡞Δ w Ϋϥε໊ ܧঝ͢ΔΫϥε ଐੑΛύϥϝʔλ ʹࢦఆ
w UZQFΛΠϯελϯεԽ͢ΔͱΫϥεʹͳΔ ಉ͡ ˢ ˠ
ϝλΫϥεΛ࣮ͯ͠ΈΔ w UZQFͷػೳΛͬͯϝλΫϥεΛ࣮ w ϝλΫϥεΫϥεΛ࡞ΔΫϥε w UZQFΠϯελϯεԽ͢ΔͱΫϥεʹͳΔ w ϝλΫϥεͷ@@OFX@@
ͰUZQFΛͬͯΫϥεΛ࡞Δ UZQFΛΠϯελϯεԽͯ͠ΫϥεΛ࡞ ࡞ͨ͠ΫϥεΛฦ͢ 6TF$MBTTఆٛ࣌ʹ.FUB$MBTT͕Πϯελ ϯεԽ͞Ε@@OFX@@ Λ࣮ߦɻฦͬͯ͘Δ ΫϥεΛDMTʹ͢Δɻ ΠϯελϯεԽͤͣʹݺΔ
ϝλΫϥεΛ࣮ͯ͠ΈΔ UZQFΛΠϯελϯεԽ ͯ͠ΫϥεΛ࡞ UZQFΛܧঝ w UZQFΛܧঝͯ͠.FUB$MBTTͰಉ༷ͷॲཧΛ࣮ݱ͢Δ w UZQF ʜ
TVQFS @@OFX@@ ʜ ͰΫϥεΛ࡞Δ
ϝλΫϥεͷ༻࣮ྫMVJHJ MVJHJ w TQPUJGZ։ൃͷύΠϓϥΠϯπʔϧ w ґଘؔͷ͋ΔॲཧΛղܾ͠ͳ͕Β࣮ߦͯ͘͠ΕΔ w "*νʔϜͰϥοϓͨ͠HPLBSUͱ͍͏πʔϧΛඪ४తʹ༻ IUUQTTQFBLFSEFDLDPNOJTIJCBHPLBSUXP[VPUVUBIVB IUUQTTQFBLFSEFDLDPNWBBBBBORVJTIHPLBSUGBMTFZVOZPOHUPLFUJOJUVJUF
MVJHJHPLBSUλεΫͷಛ w ͲͷλεΫΛ࣮ߦ͢Δ͔จࣈྻͰࢦఆՄೳ w UBTLύϥϝʔλͰίʔυҎ֎͔ΒจࣈྻͰͷ੍ޚ͕Մೳ w ઃఆϑΝΠϧ͔Β w ίϚϯυϥΠϯύϥϝʔλ͔ΒɹɹͳͲ 5BTL"
5BTL# \λεΫ໊TUSλεΫΫϥεPCKFDU^ ͷؔΛอ͍࣋ͯ͠ΔͨΊ 5BTL"ʹґଘ JOUͷύϥϝʔλΛ࣋ͭ w MVJHJHPLBSUͰλεΫͱ͍͏Ϋϥε୯ҐͰॲཧΛॻ͘
λεΫͷ໊લͱ࣮ମΛͲ͏อ͍࣋ͯ͠Δ͔ʁ w λεΫΫϥεͷϝλΫϥεͰ͋Δ3FHJTUFSʹλεΫΫϥεΛอ͍࣋ͯ͠Δ w ֤5BTLએݴ࣌ʹ3FHJTUFS@SFHʹλεΫ͕Ճ͞Ε͍ͯ͘ w 3FHJTUFS@SFHΛࢀর͢Δ͜ͱͰޙͰλεΫͷҰཡ͕औΕΔ ϝλΫϥε BCD"#$.FUB UZQFΛܧঝ
Λܧঝ 3FHJTUFS@SFHʹλεΫΫϥεΛՃ DMT λεΫΫϥε Λ࡞
λεΫ໊ͱλεΫΫϥεΛͲ͏อ͍࣋ͯ͠Δ͔ʁ w ͲͷλεΫΛ࣮ߦ͢Δ͔จࣈྻͰࢦఆՄೳ w ύϥϝʔλͰίʔυҎ֎͔ΒจࣈྻͰͷ੍ޚ͕Մೳ 3FHJTUFS@SFHʹ͋ΔλεΫ͔Β֘͢ΔλεΫΛ୳࣮ͯ͠ߦ͢Δ 3FHJTUFS@SFHʹ͋ΔλεΫ͔Β֘͢ΔλεΫΛ୳ͯ͠ύϥϝʔλΛηοτ͢Δ