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![if key in GLOBAL_DICT:
gevent.sleep(0.001)
del GLOBAL_DICT[key]
쓰는 법이 멀티스레딩과 다르지 않다 보니
코딩할 때 고달플 때도 있어요.](https://image.slidesharecdn.com/random-161024155628/85/-148-320.jpg?cb=1477382697)
![if key in GLOBAL_DICT:
gevent.sleep(0.001)
del GLOBAL_DICT[key]
이렇게 첫 줄에서
아무리 조건을 확보해 놔도](https://image.slidesharecdn.com/random-161024155628/85/-149-320.jpg?cb=1477382697)
![if key in GLOBAL_DICT:
gevent.sleep(0.001)
del GLOBAL_DICT[key]
스레드 봉쇄가 발생한 이후에는](https://image.slidesharecdn.com/random-161024155628/85/-150-320.jpg?cb=1477382697)
![if key in GLOBAL_DICT:
gevent.sleep(0.001)
del GLOBAL_DICT[key] KeyError!
조건이 무효해질 수 있거든요.](https://image.slidesharecdn.com/random-161024155628/85/-151-320.jpg?cb=1477382697)
![if key in GLOBAL_DICT:
gevent.sleep(0.001)
del GLOBAL_DICT[key] KeyError!
그럼에도 저희가
gevent를 택했던 이유는](https://image.slidesharecdn.com/random-161024155628/85/-152-320.jpg?cb=1477382697)
![async def main():
f1 = aiohttp.get(url1)
f2 = aiohttp.get(url2)
f3 = aiohttp.get(url3)
for fut in [f1, f2, f3]:
await fut
...](https://image.slidesharecdn.com/random-161024155628/85/-180-320.jpg?cb=1477382697)
![async def main():
f1 = aiohttp.get(url1)
f2 = aiohttp.get(url2)
f3 = aiohttp.get(url3)
for fut in [f1, f2, f3]:
await fut
...](https://image.slidesharecdn.com/random-161024155628/85/-181-320.jpg?cb=1477382697)
![async def main():
f1 = aiohttp.get(url1)
f2 = aiohttp.get(url2)
f3 = aiohttp.get(url3)
for fut in [f1, f2, f3]:
await fut
...](https://image.slidesharecdn.com/random-161024155628/85/-182-320.jpg?cb=1477382697)
![async def main():
f1 = aiohttp.get(url1)
f2 = aiohttp.get(url2)
f3 = aiohttp.get(url3)
for fut in [f1, f2, f3]:
await fut
...](https://image.slidesharecdn.com/random-161024155628/85/-183-320.jpg?cb=1477382697)
![#include "crow.h"
int main() {
crow::SimpleApp app;
CROW_ROUTE(app, "/")([](){
return "Hello world";
});
}
우리 회사 하재승 님이 만드신](https://image.slidesharecdn.com/random-161024155628/85/-201-320.jpg?cb=1477382697)
![#include "crow.h"
int main() {
crow::SimpleApp app;
CROW_ROUTE(app, "/")([](){
return "Hello world";
});
}
C++ 웹 프레임워크 Cro...](https://image.slidesharecdn.com/random-161024155628/85/-202-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
yield ...](https://image.slidesharecdn.com/random-161024155628/85/-209-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
yield ...](https://image.slidesharecdn.com/random-161024155628/85/-210-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
yield ...](https://image.slidesharecdn.com/random-161024155628/85/-211-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
yield ...](https://image.slidesharecdn.com/random-161024155628/85/-212-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
yield ...](https://image.slidesharecdn.com/random-161024155628/85/-213-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
return...](https://image.slidesharecdn.com/random-161024155628/85/-214-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
return...](https://image.slidesharecdn.com/random-161024155628/85/-215-320.jpg?cb=1477382697)
![def wsgi_app(environ, start_response):
headers = [('Content-Type', 'text/plain')]
start_response('200 OK', headers)
return...](https://image.slidesharecdn.com/random-161024155628/85/-216-320.jpg?cb=1477382697)
![❯ python cli.py -n "Heungsub Lee"
Hi Heungsub Lee!
❯ python cli.py --help
Usage: cli.py [OPTIONS]
Options:
-n, --name TEXT...](https://image.slidesharecdn.com/random-161024155628/85/-240-320.jpg?cb=1477382697)
![❯ python cli.py -n "Heungsub Lee"
Hi Heungsub Lee!
❯ python cli.py --help
Usage: cli.py [OPTIONS]
Options:
-n, --name TEXT...](https://image.slidesharecdn.com/random-161024155628/85/-241-320.jpg?cb=1477382697)
![❯ python cli.py -n "Heungsub Lee"
Hi Heungsub Lee!
❯ python cli.py --help
Usage: cli.py [OPTIONS]
Options:
-n, --name TEXT...](https://image.slidesharecdn.com/random-161024155628/85/-242-320.jpg?cb=1477382697)
![❯ python cli.py -n "Heungsub Lee"
Hi Heungsub Lee!
❯ python cli.py --help
Usage: cli.py [OPTIONS]
Options:
-n, --name TEXT...](https://image.slidesharecdn.com/random-161024155628/85/-243-320.jpg?cb=1477382697)
![@pytest.mark.parametrize('x, y', [
(42, 1), (21, 2), (7, 6)
])
def test_answers(x, y):
assert x * y == 42
가령 테스트케이스에 매개변수를...](https://image.slidesharecdn.com/random-161024155628/85/-283-320.jpg?cb=1477382697)
![@pytest.mark.parametrize('x, y', [
(42, 1), (21, 2), (7, 6)
])
def test_answers(x, y):
assert x * y == 42
알아서 인자를 바꿔가면서 테스...](https://image.slidesharecdn.com/random-161024155628/85/-284-320.jpg?cb=1477382697)
![❯ python
Python 2.7.11+ (default, Apr 17 2016, 14:00:29)
[GCC 5.3.1 20160413] on linux2
Type "help", "copyright", "credits...](https://image.slidesharecdn.com/random-161024155628/85/-374-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-383-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-384-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-385-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-386-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-387-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-388-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-389-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-390-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-391-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-392-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-393-320.jpg?cb=1477382697)
![>>> world_id = db.find_all(World.id)[0]
>>> world = db.load(World, world_id)
>>> islands = world.all_islands()
>>> for isl...](https://image.slidesharecdn.com/random-161024155628/85/-394-320.jpg?cb=1477382697)
![stack = []
while f:
stack.append(f)
f = f.f_back
stack.reverse()
stack = deque()
while f:
stack.appendleft(f)
이런 식으로 list에...](https://image.slidesharecdn.com/random-161024155628/85/-439-320.jpg?cb=1477382697)
![stack = []
while f:
stack.append(f)
f = f.f_back
stack.reverse()
stack = deque()
while f:
stack.appendleft(f)
deque을 쓰면 처음...](https://image.slidesharecdn.com/random-161024155628/85/-440-320.jpg?cb=1477382697)
![>>> sub = OrderedDict([('S', 1), ('U', 2), ('B', 3)])
>>> sub['S']
1
>>> sub.keys()
['S', 'U', 'B']
OrderedDict는 dict의 서브클...](https://image.slidesharecdn.com/random-161024155628/85/-441-320.jpg?cb=1477382697)
![>>> sub = OrderedDict([('S', 1), ('U', 2), ('B', 3)])
>>> sub['S']
1
>>> sub.keys()
['S', 'U', 'B']
순서도 중요하고
키로 접근하는 것도 중요...](https://image.slidesharecdn.com/random-161024155628/85/-442-320.jpg?cb=1477382697)
![>>> Vector2 = namedtuple('Vector2', ['x', 'y'])
>>> xy = Vector2(20, 59)
>>> xy.x
20
>>> x, y = xy
namedtuple은 tuple의 서브클래...](https://image.slidesharecdn.com/random-161024155628/85/-443-320.jpg?cb=1477382697)
![>>> Vector2 = namedtuple('Vector2', ['x', 'y'])
>>> xy = Vector2(20, 59)
>>> xy.x
20
>>> x, y = xy
이때 각 원소에
이름을 붙일 수 있어요.](https://image.slidesharecdn.com/random-161024155628/85/-444-320.jpg?cb=1477382697)
![>>> Vector2 = namedtuple('Vector2', ['x', 'y'])
>>> xy = Vector2(20, 59)
>>> xy.x
20
>>> x, y = xy
이것으로 만든 클래스도 tuple 처럼 불...](https://image.slidesharecdn.com/random-161024155628/85/-445-320.jpg?cb=1477382697)
![>>> Vector2 = namedtuple('Vector2', ['x', 'y'])
>>> xy = Vector2(20, 59)
>>> xy.x
20
>>> x, y = xy
저는 사소한 클래스 만들 땐
class문을...](https://image.slidesharecdn.com/random-161024155628/85/-446-320.jpg?cb=1477382697)
![>>> Vector2 = namedtuple('Vector2', ['x', 'y'])
>>> xy = Vector2(20, 59)
>>> xy.x
20
>>> x, y = xy
이 쪽을 더 선호하는 편이에요.](https://image.slidesharecdn.com/random-161024155628/85/-447-320.jpg?cb=1477382697)
![>>> c = Counter('nexon')
>>> c['n']
2
>>> c['x']
1
Counter는 dict의 서브클래스고
이렇게 뭔가 간단히 셀 때 쓰기 좋아요.](https://image.slidesharecdn.com/random-161024155628/85/-448-320.jpg?cb=1477382697)
![>>> d = defaultdict(int)
>>> d['yo']
0
defaultdict는 없는 키에 접근했을 때
KeyError를 내는 대신](https://image.slidesharecdn.com/random-161024155628/85/-449-320.jpg?cb=1477382697)
![>>> d = defaultdict(int)
>>> d['yo']
0
팩토리함수 실행 결과를
채워주는 dict예요.](https://image.slidesharecdn.com/random-161024155628/85/-450-320.jpg?cb=1477382697)
![root = inf_dict()
root[0][1][2][3][4][5][6][7] = 'So deep!'
그래서 아무 키나
끊임 없이 써내려 갈 수 있어요.](https://image.slidesharecdn.com/random-161024155628/85/-453-320.jpg?cb=1477382697)
![foo = [1, 10, 100, 1000]
x = bisect_left(foo, 42)
foo.insert(x, 42)
from sortedcontainer import SortedList
bar = SortedLis...](https://image.slidesharecdn.com/random-161024155628/85/-456-320.jpg?cb=1477382697)
![foo = [1, 10, 100, 1000]
x = bisect_left(foo, 42)
foo.insert(x, 42)
from sortedcontainer import SortedList
bar = SortedLis...](https://image.slidesharecdn.com/random-161024155628/85/-457-320.jpg?cb=1477382697)
![foo = [1, 10, 100, 1000]
x = bisect_left(foo, 42)
foo.insert(x, 42)
from sortedcontainer import SortedList
bar = SortedLis...](https://image.slidesharecdn.com/random-161024155628/85/-458-320.jpg?cb=1477382697)
![>>> from bidict import bidict
>>> type_table = bidict()
>>> type_table[1] = Ping
>>> type_table[2] = Pong
>>> type_table.i...](https://image.slidesharecdn.com/random-161024155628/85/-459-320.jpg?cb=1477382697)
![>>> from bidict import bidict
>>> type_table = bidict()
>>> type_table[1] = Ping
>>> type_table[2] = Pong
>>> type_table.i...](https://image.slidesharecdn.com/random-161024155628/85/-460-320.jpg?cb=1477382697)
![>>> from bidict import bidict
>>> type_table = bidict()
>>> type_table[1] = Ping
>>> type_table[2] = Pong
>>> type_table.i...](https://image.slidesharecdn.com/random-161024155628/85/-461-320.jpg?cb=1477382697)
![>>> list(seq)
[1, 9, 25, 49, 81, 121, ...]
결과를 보기 위해 list 등으로 감싸면
그때야 비로소 이터레이션이 돌죠.](https://image.slidesharecdn.com/random-161024155628/85/-483-320.jpg?cb=1477382697)
![>>> list(seq)
[1, 9, 25, 49, 81, 121, ...]
레이지하지 않았다면 이터레이션이
250만 바퀴 돌았을 로직인데](https://image.slidesharecdn.com/random-161024155628/85/-484-320.jpg?cb=1477382697)
![>>> list(seq)
[1, 9, 25, 49, 81, 121, ...]
이 방법으로
딱 100만 바퀴만 돌 수 있게 됩니다.](https://image.slidesharecdn.com/random-161024155628/85/-485-320.jpg?cb=1477382697)
![>>> list(gen)
[1, 2, 3]
>>> list(gen)
[]
def gen():
yield 1
yield 2
yield 3
제너레이터는 딱 한 바퀴만
돌릴 수 있어서](https://image.slidesharecdn.com/random-161024155628/85/-488-320.jpg?cb=1477382697)
![>>> list(gen)
[1, 2, 3]
>>> list(gen)
[]
def gen():
yield 1
yield 2
yield 3
여러 번 돌려야 하는 경우에
당황스러울 수 있어요.](https://image.slidesharecdn.com/random-161024155628/85/-489-320.jpg?cb=1477382697)
![[NDC18] 만들고 붓고 부수고 - 〈야생의 땅: 듀랑고〉 서버 관리 배포 이야기](https://cdn.slidesharecdn.com/ss_thumbnails/ndc18-180429152609-thumbnail.jpg?cb=1525015803)
