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Gotanda.pm #1
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Mihyaeru
June 11, 2014
Programming
200
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Gotanda.pm #1
Python使いから見たPerl @ Gotanda.pm #1
Mihyaeru
June 11, 2014
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Transcript
1ZUIPO͍͔Βݟͨ1FSM (PUBOEBQN !NJIZBFSV
ࣗݾհ w ϛώϟΤϧ!NJIZBFSV w 1ZUIPO 0CKFDUJWF$ śƂŠƃٙ 1FSM w
ΏͱΓ7JNNFS w ζϰΟζμʔઓಆһ
Α͘--ͬͯҰׅΓʹ͞ΕΔ͠ 1ZUIPOΘ͔Ε༨༟Ͱ͠ΐ
ͭ1FSM
sub say_hello { my $name = shift; ! print "Hello,
$name\n"; }
͋ΕͬʁҾʁ TIJGUͬͯͳΜͶΜ
sub sum_numbers { my $sum; for (@_) { $sum +=
$_; } ! return $sum; }
Μͬʁ
$_ @_
@_ͱ͔$_ͱ͔Ͳ͔͜ΒདྷͨΜ ͳΜ͡Ό͍͜ΓΌʔʂ
࠷ॳʹࢥͬͨෆຬ w มͳه߸ଟͯ͘ҙຯෆ໌ w ίϯςΩετʁʁʁ w ຖճNZͬͯॻ͘ͷ໘͍͘͞ w ਅِΣʜʜ w
ϦϑΝϨϯεपΓ͕Θ͔Γʹ͍͘ w ҾϦετͲ͜ʂʁ ʜଞʹ͔͚͋ͬͨͩͲΕͨ͆
มͳه߸ଟͯ͘ҙຯෆ໌ $_ @_ 1ZUIPOͰ͜ΜͳʹढจΊ͍ͨมग़ͯ͜ͳ͔ͬͨʂ $! $@ ͨͿΜʜ $. $/
͜Μ͖ͯ͢ͱʁʁʁ @a = (0, 1, 2) Ϧετ ίϯςΩετ 0, 1,
2 εΧϥʔ ίϯςΩετ 3 ཁૉ͕Γ͔ͨͬͨΒlen()ͱ͔໌ࣔతʹॻ͖͍ͨ ॴʹΑͬͯҙຯ͢Δͱ͜Ζ͕ҧ͏ʜʜͩͱʜʜ
NZࢯ w --ͬͯݴΘΕΔ͘Β͍ͩ͠ɺϥΠτʹॻ͖͍ͨ w 1ZUIPOͰम০ࢠͳ͠ͰϩʔΧϧม
ਅِΣʜʜ w ਅِΛද͢໌֬ͳ͕ͭͳ͍ w 5SVF 'BMTFཉ͍ͬ͢͠ w ίϯςΩετ૬·ͬͯѻ͍͕͍͠
ϦϑΝϨϯε w ࠷ॳɺ ͱ<>ಉͩ͡ͱࢥ͍ͬͯͨ w εΧϥʔมͳͷʹྻʂ w 1ZUIPOͰྻͱݴͬͨΒ͜Ε͚ͩ @a =
(0, 1, 2); $ref = \@a; $ref = [0, 1, 2]; a = [0, 1, 2]
ͳΜͰҾϦετͳ͍ͷ w !@Λड͚ͱΔ͚Ͳ͍ํࣗ༝͗͢ w 1ZUIPOͩͱؔͷσϑΥϧτΛઃఆͰ͖Δ͠ ΩʔϫʔυͰݺͿ͜ͱग़དྷΔʂ my ($a, $b) =
@_; my $a = shift; my %args = @_;
ͪͳΈʹ w σϑΥϧτΛͬͨݺͼग़͠ w ී௨ͷݺͼग़͠ w Ωʔϫʔυݺͼग़͠ def hello(name =
'mihyaeru'): print 'Hello, %s' % name ! hello() hello('dareka') hello(name = 'anata')
ෆຬΛ๊͖ͭͭ ϲ݄͕ܦա
࠷ॳʹࢥͬͨෆຬ w มͳه߸ଟͯ͘ҙຯෆ໌ w ίϯςΩετʁʁʁ w ຖճNZͬͯॻ͘ͷ໘͍͘͞ w ਅِΣʜʜ w
ϦϑΝϨϯεपΓ͕Θ͔Γʹ͍͘ w ҾϦετͲ͜ʂʁ
࠷ॳʹࢥͬͨෆຬࠓ w มͳه߸ଟͯ͘ҙຯෆ໌ w ίϯςΩετʁʁʁ w ຖճNZͬͯॻ͘ͷ໘͍͘͞ w ਅِΣʜʜ w
ϦϑΝϨϯεपΓ͕Θ͔Γʹ͍͘ w ҾϦετͲ͜ʂʁ ׳ΕΕා͘ͳ͍ʂ ׳ΕΕʢ͈́ ॻ͍ͨํ͕҆৺ײ͋Δ ਅِΣʜʜ Ҿʹ໊લͳ͘୯ͳΔϦετ ະͩʹͬ͘͠Γ͜ͳ͍
ෆຬ͔Γݴͬͯ ΞϨͳͷͰ
ؾʹೖ͍ͬͯΔͱ͜Ζ w ແ໊͕͍͍ؔ͢ w NBQͱ͔HSFQͷײ͕͖͡ w ϝιουݺͼग़࣌͠ͷୈҰҾʹTFMG͕ೖͬͯ͘Δ
ແ໊͕͍͍ؔ͢ w 1ZUIPOʹMBNCEBͱ͍͏ແ໊ؔΛ࡞Δه๏ΞϦ w ࣜΛ͔ͭ͠ೖΕΒΕͳ͍͔Βจͷॲཧμϝ hoge_call(sub { # do #
something # hoge }); def temp(): # do # something # hoge ! hoge_call(temp) 1FSM 1ZUIPO
NBQͱ͔HSFQ͕ྑ͍ײ͡ ҾΛح͚ͩʹߜΓࠐΜͰɺɺɺ ͨ͠ͷྻʹ͢Δɺɺɺ తͳॲཧ my @squared_odds = map { $_
* $_ } grep { $_ % 2 == 1 } @_;
1ZUIPOͩͱ [x * x for x in nums if x
% 2 == 1]
1ZUIPOͩͱ [x * x for x in nums if x
% 2 == 1] NBQʹ૬ HSFQʹ૬
Ϧετแදه [x * x for x in X if x
% 2 == 1] {x2 | x ∈ X, x % 2 = 1} ֶͷू߹ʹ͓͚Δแతදه͕ݩʹͳ͍ͬͯΔ
ϝιουͷTFMG 1ZUIPOΛኲኵͱͤͯۙ͞ײ͋Γ sub method { my ($self, $hoge) = @_;
} def method(self, hoge): pass
ಥ͚ͩͲ ͦΜͳ͜ΜͳͰ
·ͱΊ w 1FSM͍࢝Ίͯϲ݄ͷਓͷײ w ֖Λ͚͋ͯΈΔͱṖ͍ͱ͜Ζ͕ଟʑ w ͋Δఔ׳ΕͰͳΜͱ͔ͳΔʂ w 1FSMා͔͚ͬͨͲࠓͰ͖ͳͱ͜Ζ͋Δʂʂ