私の知らないPythonの世界

pyfukuoka #3
at 2017/12/20
in Fukuoka City

Transcript

1. ࢲͷ஌Βͳ͍
   1ZUIPOͷੈք !NBTTZVV
   1Z'VLVPLB
   
    ʙσίϨʔλʔΛͦ͑ͯʙ
2. ࣗݾ঺հ !NBTTZVV
   1ZUIPO͸झຯͰ࢖ͬͯ·͢
   ͔Β͋͛ΛࡇΓਸΊΔΤϯδχϟʔ
   ϑϩϯτ͔ΒόοΫΤϯυ·Ͱ޿͘ઙ͘
   
   
   4PTJBM
   
   
   
   
   
   
   
   UXJUUFS
   
   NBTT@TTO
   
   
   
   
   
   
   DPOOQBTTɿNBTTZVV
3. ࠓ೔ͷ͓࿩͸
   1ZUIPOΛ࢖͍࢝Ίͯ
   ʮ΄΄͏ʯ
   ͱࢥͬͨ͜ͱΛ
   5JQTతʹ·ͱΊ·ͨ͠
4. ࠓ೔ͷ͓࿩͸
   1ZUIPOΛ࢖͍࢝Ίͯ
   ʮ΄΄͏ʯ
   ͱࢥͬͨ͜ͱΛ
   5JQTతʹ·ͱΊ·ͨ͠
5. ࠓ೔ͷ͓࿩͸
   ߴ֊ؔ਺ͬͯͳΜ͡Ό͍ʁ
   σίϨʔλʔͬͯͳΜ͡Ό͍ʁ
   ͱ͍͏͓࿩Ͱ͢
6. ͓඼ॻ͖ ɾpMUFSɺNBQɺSFEVDF
   ɾߴ֊ؔ਺
   ɾσίϨʔλʔ
   ɾδΣωϨʔλʔ
   ɾ಺แදهͱ͔ͱ͔
7. ஫ҙ ࠓճ͸1ZUIPOͰͷ͓࿩Ͱ͢
   ʢ1ZUIPOͱ͸ॻ͖ํ͕ҟͳΔ৔߹͕͋Γ·͢ʣ
8. pMUFS
   NBQ ΠςϨʔλΛ౉͢ͱɺͦΕͧΕରԠͨ͠ॲཧΛߦͬͯ
   ΠςϨʔλΛฦͯ͘͠ΕΔ
   ʢิ଍ʣ
   ɹɹɹ1ZUIPOɿΠςϨʔλΛฦ͢
   ɹɹɹ1ZUIPOɿϦετΛฦ͢
9. pMUFS ৚݅ʹҰக͢ΔཁૉͷΈΛநग़͢Δ
   ྫ
   #ۮ਺Λฦ͢ def is_even(val): if val % 2 == 0: return val print(list(filter(is_even, range(1,10)))) >>>[2, 4, 6, 8] #LambdaΛ࢖ͬͯॻ͘ͱ print(list(filter(lambda x: x % 2 == 0, range(1, 10)))) >>>[2, 4, 6, 8]
10. NBQ શͯͷཁૉʹॲཧΛߦͬͨ݁ՌΛฦ͢
    ྫ
    #ഒฦͩ͠ʂ def double(val): return val * 2 print(list(map(double, range(1,10)))) >>>[2, 4, 6, 8, 10, 12, 14, 16, 18] #LambdaΛ࢖ͬͯॻ͘ͱ print(list(map(lambda x: x * 2, range(1, 10)))) >>>[2, 4, 6, 8]
11. SFEVDF શͯͷཁૉΛ·ͱΊΔ
    ʢ1ZUIPȌͰ͸GVODUPPMTͷΠϯϙʔτ͕ඞཁʣ
    ྫ
    import functools #ͻͨ͢Β଍ͯ͠ฦ͢ def add(val1, val2): return val1 + val2 print(functools.reduce(add, range(1,10))) >>>45 #LambdaΛ࢖ͬͯॻ͘ͱ print(functools.reduce(lambda x, y:x + y, range(1,10))) >>>45
12. ߴ֊ؔ਺ ߴ֊ؔ਺͸ؔ਺ΛҾ਺ʹͨ͠Γɺ͋Δ͍͸ؔ਺Λ໭Γ஋ͱ͢Δ΋ͷͰ͋Γɺ Ҿ਺΍໭Γ஋ͷؔ਺΋·ͨߴ֊ؔ਺ͱͳΓಘΔɻ 8JLJ1FEJBʹΑΔͱ
13. ߴ֊ؔ਺ Ҿ਺ʹؔ਺Λ࣋ͭؔ਺
    ໭Γ஋͕ؔ਺ʹͳΔؔ਺
    ΄΄͏ɾɾɾʁ ߴ֊ؔ਺͸ؔ਺ΛҾ਺ʹͨ͠Γɺ͋Δ͍͸ؔ਺Λ໭Γ஋ͱ͢Δ΋ͷͰ͋Γɺ Ҿ਺΍໭Γ஋ͷؔ਺΋·ͨߴ֊ؔ਺ͱͳΓಘΔɻ 8JLJ1FEJBʹΑΔͱ
14. ͨͱ͑͹͜Μͳߴ֊ؔ਺ PVUFS ͷҾ਺ʹIFMMP Λ౉͢
    PVUFS ͷதͰJOOFS Λฦͯ͠Δ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka def hello(): print ("Hello PyFukuoka!") #࣮ߦ outer(hello) >>> before execute >>> Hello PyFukuoka! >>> after execute
15. ࣮ߦ͞Ε͍ͯΔؔ਺ ࣮ߦ͍ͯ͠Δͷ͸PVUFS
    ผ్IFMMP Λݺͼग़͢͜ͱ΋Մೳ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka def hello(): print ("Hello PyFukuoka!") #࣮ߦ outer(hello) >>> before execute >>> Hello PyFukuoka! >>> after execute
16. ݩͷؔ਺Λ௥Ճ͍͍ͯͪͪ͠ݺͼग़͢ͷʁ ʮ͜ͷؔ਺ΛݺͿͱ͖͸ઈରʹηοτͰݺͿॲཧʯ
    ͬͯ͋Γ·ͤΜʁ
    ͨͱ͑͹ɺ
    ɾϩάΠϯ൑ఆ͸ඞͣ΍Βͳ͍ͱ͍͚ͳ͍
    ɾ*O0VUͰϩάग़ྗ͕ඞཁʢࣗྗ4UBDL5SBDFʣ
    ͳͲͳͲɾɾ
    ͍͍ͪͪ౉ͯ͠ݺͼग़͢ͷ໘౗Ͱ͢ΑͶʁ
17. ͦ͜ͰσίϨʔλʔ ؆୯ʹ͍͏ͱɺߴ֊ؔ਺ͷϥούʔ
    ؔ਺ఆٛ࣌ʹʮˏϚʔΫʯΛ͚ͭΔ͜ͱͰɺ
    ఆٛ͞Εͨؔ਺Λ࣮ߦ͢Δͱ͖ʹࣗಈతʹߴ֊ؔ਺
    Λݺͼग़͢͜ͱ͕Ͱ͖Δ
18. ͨͱ͑͹ ઌ΄Ͳͷίʔυ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka def hello(): print ("Hello PyFukuoka!") #࣮ߦ outer(hello) >>> before execute >>> Hello PyFukuoka! >>> after execute
19. IFMMP Λϥοϐϯά σίϨʔλʔΛ࢖͏ͱ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka @outer def hello(): print ("Hello PyFukuoka!") #࣮ߦ hello() >>> before execute >>> Hello PyFukuoka! >>> after execute IFMMP
    Λݺͼग़ͯ͠΋݁Ռ͸มΘΒͣ
20. IFMMP Λϥοϐϯά σίϨʔλʔΛ࢖͏ͱ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka @outer def hello(): print ("Hello PyFukuoka!") #࣮ߦ hello() >>> before execute >>> Hello PyFukuoka! >>> after execute ΍ͬͯΔ͜ͱ͸
    EFG
    IFMMP 
    
    
    
    
    
    
    QSJOU
    lIFMMP
    1Z'VLVPLBz
    IFMMP
    
    PVUFS IFMMP
    IFMMP
    ͱಉ͜͡ͱ
21. ࣮ߦ͞Ε͍ͯΔ໊લʹ஫ҙ ͜ͷ৔߹ɺPVUFSσίϨʔλʔΛద༻ͨ࣌͠఺Ͱ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka @outer def hello(): print ("Hello PyFukuoka!") #࣮ߦ͞Ε͍ͯΔؔ਺໊ print(hello.__name__) >>> inner ࣮ࡍʹ࣮ߦ͞ΕΔؔ਺͕ೖΕସΘΔ
22. ΋ͱͷؔ਺৘ใΛอ͓࣋ͯͨ͘͠Ίʹ͸ GVODUPSTXSBQTσίϨʔλΛ࢖͏
23. GVODUPPMTXSBQTΛσίϨʔτ͢Δ ݩʑͷؔ਺৘ใΛͦͷ··දࣔ͢Δ͜ͱ͕Ͱ͖ΔΑ͏ʹͳͬͨʂ #࣮ߦલޙʹςΩετΛࠩ͠ࠐΉΑʂ def outer(func): @functools.wraps(func) def inner(): print("before execute") func() print("after execute") return inner() #͜Μʹͪ͸PyFukuoka @outer def hello(): print ("Hello PyFukuoka!") #࣮ߦ͞Ε͍ͯΔؔ਺໊ print(hello.__name__) >>> hello
24. ؆୯ʹ·ͱΊΔͱ ɾߴ֊ؔ਺͸Ҿ਺΍໭Γ஋ʹؔ਺͕͋Δؔ਺
    ɾσίϨʔλʔΛ࢖͏ͱߴ֊ؔ਺ͷهड़͕؆୯ʹͳΔ
    ɾݩؔ਺ͷ৘ใΛอ࣋͢Δʹ͸GVODUPPMTXSBQTΛ࢖͏
25. ͓·͚ ࣮ߦݩͷؔ਺ʹҾ਺͕͋Δ৔߹ import functools def outer(func): @functools.wraps(func) def inner(*args, **kwargs): print("before execute") func(*args, **kwargs) print("after execute") return inner @outer() def hello(*args, **kwargs): print(args[0]) print(kwargs["kwargs1"]) #࣮ߦ hello("hello", kwargs1 = "PyFukuoka") >>> before execute >>> hello >>> PyFukuoka >>> after execute
26. ͓·͚ σίϨʔλʹ΋࣮ߦݩͷؔ਺ʹ΋Ҿ਺͕͋Δ৔߹ import functools def outer(*dec_args, **dec_kwargs): def middle(func): @functools.wraps(func) def inner(*args, **kwargs): print(dec_args[0]) print("before execute") func(*args, **kwargs) print("after execute") print(dec_kwargs["dec_kwargs1"]) return inner return middle #͜Μʹͪ͸PyFukuoka @outer("decorator args1", dec_kwargs1 = "decorator kwargs1") def hello(*args, **kwargs): print(args[0]) print(kwargs["kwargs1"]) #࣮ߦ hello("hello", kwargs1 = "PyFukuoka") >>> decorator args1 >>> before execute >>> hello >>> PyFukuoka >>> after execute >>> decorator kwargs1
27. ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠