Welcome to async/await era

Welcome to
async/await era
Igor Davydenko
PyCon Finland 2015

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I am...
Igor Davydenko
Python & React.js developer
From Kyiv, Ukraine
Works on Ezhome Inc.
Primarly designs & develops backend API
Personal Site
@ GitHub
@ Twitter

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PEP 492
Coroutines with async and await syntax

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Quick Summary
Created by Yuri Selivanov in April, 2015
Included in Python 3.5
Added 4 new statements to the standard library:
a
s
y
n
c d
e
f
a
w
a
i
t
a
s
y
n
c w
i
t
h
a
s
y
n
c f
o
r
Received great response from the Python community
PEP 492 @ Python.org

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@
a
s
y
n
c
i
o
.
c
o
r
o
u
t
i
n
e
i
m
p
o
r
t a
s
y
n
c
i
o
@
a
s
y
n
c
i
o
.
c
o
r
o
u
t
i
n
e
d
e
f h
e
l
l
o
(
)
:
r
e
t
u
r
n '
H
e
l
l
o
, w
o
r
l
d
!
'
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
m
e
s
s
a
g
e = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
h
e
l
l
o
(
)
)
p
r
i
n
t
(
m
e
s
s
a
g
e
)
l
o
o
p
.
c
l
o
s
e
(
)

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a
s
y
n
c d
e
f
a
s
y
n
c d
e
f h
e
l
l
o
(
)
:
r
e
t
u
r
n '
H
e
l
l
o
, w
o
r
l
d
!
'
i
m
p
o
r
t a
s
y
n
c
i
o
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
m
e
s
s
a
g
e = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
h
e
l
l
o
(
)
)
p
r
i
n
t
(
m
e
s
s
a
g
e
)
l
o
o
p
.
c
l
o
s
e
(
)

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@
a
s
y
n
c
i
o
.
c
o
r
o
u
t
i
n
e + y
i
e
l
d f
r
o
m
i
m
p
o
r
t a
s
y
n
c
i
o
f
r
o
m a
i
o
h
t
t
p i
m
p
o
r
t c
l
i
e
n
t
@
a
s
y
n
c
i
o
.
c
o
r
o
u
t
i
n
e
d
e
f f
e
t
c
h
_
p
a
g
e
(
u
r
l
)
:
r
e
s
p
o
n
s
e = y
i
e
l
d f
r
o
m c
l
i
e
n
t
.
g
e
t
(
u
r
l
)
r
e
t
u
r
n (
y
i
e
l
d f
r
o
m r
e
s
p
o
n
s
e
.
t
e
x
t
(
)
)
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
c
o
n
t
e
n
t = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
f
e
t
c
h
_
p
a
g
e
(
'
h
t
t
p
:
/
/
f
i
.
p
y
c
o
n
.
o
r
g
/
'
)
)
p
r
i
n
t
(
c
o
n
t
e
n
t
)
l
o
o
p
.
c
l
o
s
e
(
)

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a
s
y
n
c d
e
f + a
w
a
i
t
a
s
y
n
c d
e
f f
e
t
c
h
_
p
a
g
e
(
u
r
l
)
:
r
e
s
p
o
n
s
e = a
w
a
i
t c
l
i
e
n
t
.
g
e
t
(
u
r
l
)
r
e
t
u
r
n a
w
a
i
t r
e
s
p
o
n
s
e
.
t
e
x
t
(
)
i
m
p
o
r
t a
s
y
n
c
i
o
f
r
o
m a
i
o
h
t
t
p i
m
p
o
r
t c
l
i
e
n
t
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
c
o
n
t
e
n
t = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
f
e
t
c
h
_
p
a
g
e
(
'
h
t
t
p
:
/
/
f
i
.
p
y
c
o
n
.
o
r
g
/
'
)
)
p
r
i
n
t
(
c
o
n
t
e
n
t
)
l
o
o
p
.
c
l
o
s
e
(
)

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w
i
t
h (
y
i
e
l
d f
r
o
m .
.
.
)
i
m
p
o
r
t a
s
y
n
c
i
o
i
m
p
o
r
t s
q
l
a
l
c
h
e
m
y a
s s
a
f
r
o
m a
i
o
p
g
.
s
a i
m
p
o
r
t c
r
e
a
t
e
_
e
n
g
i
n
e
@
a
s
y
n
c
i
o
.
c
o
r
o
u
t
i
n
e
d
e
f c
o
u
n
t
_
d
a
t
a
(
d
s
n
)
:
e
n
g
i
n
e = y
i
e
l
d f
r
o
m c
r
e
a
t
e
_
e
n
g
i
n
e
(
d
s
n
)
w
i
t
h (
y
i
e
l
d f
r
o
m e
n
g
i
n
e
) a
s c
o
n
n
:
q
u
e
r
y = s
a
.
s
e
l
e
c
t
(
.
.
.
)
.
c
o
u
n
t
(
)
r
e
t
u
r
n (
y
i
e
l
d f
r
o
m c
o
n
n
.
s
c
a
l
a
r
(
q
u
e
r
y
)
)
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
c
o
u
n
t
e
r = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
c
o
u
n
t
_
d
a
t
a
(
'
p
o
s
t
g
r
e
s
q
l
:
/
/
.
.
.
'
)
)
p
r
i
n
t
(
c
o
u
n
t
e
r
)
l
o
o
p
.
c
l
o
s
e
(
)

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a
s
y
n
c w
i
t
h
f
r
o
m .
u
t
i
l
s i
m
p
o
r
t C
o
n
n
e
c
t
i
o
n
C
o
n
t
e
x
t
M
a
n
a
g
e
r
a
s
y
n
c d
e
f c
o
u
n
t
_
d
a
t
a
(
d
s
n
)
:
e
n
g
i
n
e = a
w
a
i
t c
r
e
a
t
e
_
e
n
g
i
n
e
(
d
s
n
)
a
s
y
n
c w
i
t
h C
o
n
n
e
c
t
i
o
n
C
o
n
t
e
x
t
M
a
n
a
g
e
r
(
e
n
g
i
n
e
) a
s c
o
n
n
:
q
u
e
r
y = s
a
.
s
e
l
e
c
t
(
.
.
.
)
.
c
o
u
n
t
(
)
r
e
t
u
r
n a
w
a
i
t c
o
n
n
.
s
c
a
l
a
r
(
q
u
e
r
y
)
i
m
p
o
r
t a
s
y
n
c
i
o
i
m
p
o
r
t s
q
l
a
l
c
h
e
m
y a
s s
a
f
r
o
m a
i
o
p
g
.
s
a i
m
p
o
r
t c
r
e
a
t
e
_
e
n
g
i
n
e
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
c
o
u
n
t
e
r = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
c
o
u
n
t
_
d
a
t
a
(
'
p
o
s
t
g
r
e
s
q
l
:
/
/
.
.
.
'
)
)
p
r
i
n
t
(
c
o
u
n
t
e
r
)
l
o
o
p
.
c
l
o
s
e
(
)

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a
s
y
n
c w
i
t
h
utils.py
c
l
a
s
s C
o
n
n
e
c
t
i
o
n
C
o
n
t
e
x
t
M
a
n
a
g
e
r
(
o
b
j
e
c
t
)
:
d
e
f _
_
i
n
i
t
_
_
(
s
e
l
f
, e
n
g
i
n
e
)
:
s
e
l
f
.
c
o
n
n = N
o
n
e
s
e
l
f
.
e
n
g
i
n
e = e
n
g
i
n
e
a
s
y
n
c d
e
f _
_
a
e
n
t
e
r
_
_
(
s
e
l
f
)
:
s
e
l
f
.
c
o
n
n = a
w
a
i
t s
e
l
f
.
e
n
g
i
n
e
.
a
c
q
u
i
r
e
(
)
r
e
t
u
r
n s
e
l
f
.
c
o
n
n
a
s
y
n
c d
e
f _
_
a
e
x
i
t
_
_
(
s
e
l
f
, e
x
c
_
t
y
p
e
, e
x
c
, t
b
)
:
t
r
y
:
s
e
l
f
.
e
n
g
i
n
e
.
r
e
l
e
a
s
e
(
s
e
l
f
.
c
o
n
n
)
f
i
n
a
l
l
y
:
s
e
l
f
.
c
o
n
n = N
o
n
e
s
e
l
f
.
e
n
g
i
n
e = N
o
n
e

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f
o
r r
o
w i
n (
y
i
e
l
d f
r
o
m .
.
.
)
:
i
m
p
o
r
t a
s
y
n
c
i
o
i
m
p
o
r
t s
q
l
a
l
c
h
e
m
y a
s s
a
f
r
o
m a
i
o
p
g
.
s
a i
m
p
o
r
t c
r
e
a
t
e
_
e
n
g
i
n
e
@
a
s
y
n
c
i
o
.
c
o
r
o
u
t
i
n
e
d
e
f f
e
t
c
h
_
d
a
t
a
(
d
s
n
)
:
d
a
t
a = [
]
e
n
g
i
n
e = y
i
e
l
d f
r
o
m c
r
e
a
t
e
_
e
n
g
i
n
e
(
d
s
n
)
w
i
t
h (
y
i
e
l
d f
r
o
m e
n
g
i
n
e
) a
s c
o
n
n
:
r
e
s
u
l
t = y
i
e
l
d f
r
o
m c
o
n
n
.
e
x
e
c
u
t
e
(
s
a
.
s
e
l
e
c
t
(
.
.
.
)
)
f
o
r r
o
w i
n r
e
s
u
l
t
:
d
a
t
a
.
a
p
p
e
n
d
(
r
o
w
)
r
e
t
u
r
n d
a
t
a
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
d
a
t
a = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
f
e
t
c
h
_
d
a
t
a
(
'
p
o
s
t
g
r
e
s
q
l
:
/
/
.
.
.
'
)
)
l
o
o
p
.
c
l
o
s
e
(
)

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a
s
y
n
c f
o
r
, R
e
s
u
l
t
I
t
e
r
a
s
y
n
c d
e
f f
e
t
c
h
_
d
a
t
a
(
d
s
n
)
:
d
a
t
a = [
]
e
n
g
i
n
e = a
w
a
i
t c
r
e
a
t
e
_
e
n
g
i
n
e
(
d
s
n
)
a
s
y
n
c w
i
t
h C
o
n
n
e
c
t
i
o
n
C
o
n
t
e
x
t
M
a
n
a
g
e
r
(
e
n
g
i
n
e
) a
s c
o
n
n
:
a
s
y
n
c f
o
r r
o
w i
n R
e
s
u
l
t
I
t
e
r
(
a
w
a
i
t c
o
n
n
.
e
x
e
c
u
t
e
(
s
a
.
s
e
l
e
c
t
(
.
.
.
)
)
)
:
d
a
t
a
.
a
p
p
e
n
d
(
r
o
w
)
r
e
t
u
r
n d
a
t
a
i
m
p
o
r
t a
s
y
n
c
i
o
i
m
p
o
r
t s
q
l
a
l
c
h
e
m
y a
s s
a
f
r
o
m a
i
o
p
g
.
s
a i
m
p
o
r
t c
r
e
a
t
e
_
e
n
g
i
n
e
f
r
o
m .
u
t
i
l
s i
m
p
o
r
t C
o
n
n
e
c
t
i
o
n
C
o
n
t
e
x
t
M
a
n
a
g
e
r
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
d
a
t
a = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
f
e
t
c
h
_
d
a
t
a
(
'
p
o
s
t
g
r
e
s
q
l
:
/
/
.
.
.
'
)
)
l
o
o
p
.
c
l
o
s
e
(
)

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a
s
y
n
c f
o
r
utils.py
f
r
o
m a
i
o
p
g
.
s
a
.
e
x
c i
m
p
o
r
t R
e
s
o
u
r
c
e
C
l
o
s
e
d
E
r
r
o
r
c
l
a
s
s R
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c
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r
a
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i
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n

View Slide

Other additions to standard library
@
t
y
p
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s
.
c
o
r
o
u
t
i
n
e bridge between generator based and native coroutines
New _
_
a
w
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_
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New functions in i
n
s
p
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c
t library as i
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, i
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b
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.
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A
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c
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r
a
t
o
r

View Slide

Conclusion on functions and methods
Method Can contain Can't contain
a
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n v
a
l
u
e a
w
a
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t

View Slide

async/await in real life
Libraries

View Slide

aiohttp
HTTP client/server for asyncio
Latest version: 0
.
1
7
.
4
http://aiohttp.readthedocs.org/
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m
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l
o
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p
.
c
l
o
s
e
(
)

View Slide

aiohttp.web
Web framework for asyncio
http://aiohttp.readthedocs.org/en/latest/web.html
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a
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View Slide

aiopg
Accessing PostgreSQL database from the asyncio
Latest version: 0
.
7
.
0
http://aiopg.readthedocs.org/
i
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c
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(
)

View Slide

aiopg.sa
Layer for executing SQLAlchemy Core queries
http://aiopg.readthedocs.org/en/stable/sa.html
i
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p
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(
)

View Slide

aioredis
Redis client library
Latest version: 0
.
2
.
4
http://aioredis.readthedocs.org/
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(
'
l
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, 6
3
7
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)
)
)
l
o
o
p
.
c
l
o
s
e
(
)

View Slide

And others
Python Asyncio Resources
MySQL: aiomysql
Mongo: asyncio_mongo
CouchDB: aiocouchdb
ElasticSearch: aioes
Memcached: aiomcache
AMQP: aioamqp
ØMQ: aiozmq

View Slide

Fetching data from remote API

View Slide

Task. Fetch data for the NFL Season
NFL Season lasts 5 preseason and 17 regular season weeks
This totals 22 requests to NFL.com endpoint
Each request can be processed asyncronously
After all requests are done we need to call extra function

View Slide

Step 1. Sync fetch week data
i
m
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(
r
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p
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s
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.
c
o
n
t
e
n
t
)

View Slide

Step 2. Sync fetch season data
d
e
f f
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c
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_
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)
.
.
.
p
o
s
t
_
c
a
l
l
(
.
.
.
)

View Slide

Step 3. Async fetch week data
f
r
o
m a
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p i
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.
r
e
a
d
(
)
)

View Slide

Step 4. Async fetch season data
i
m
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l
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l
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(
)

View Slide

Step 5. Running fetching season data
scripts/fetch_season_data.py
i
m
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f m
a
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p
y 2
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1
5

View Slide

Step 6. See in action
.
.
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l
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a
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P
R
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. W
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k 4 p
r
o
c
e
s
s
e
d
!
.
.
.

View Slide

Backend API application

View Slide

Task. Provide an API for week data
NFL.com still returns data in X
M
L
We need this data in G
r
a
p
h
Q
L
Okay, okay, actually in J
S
O
N
And if there are no live games, we don't need to fetch data directly from NFL

View Slide

Step 0. Original NFL.com data

View Slide

Step 1. Flask base application
f
r
o
m f
l
a
s
k i
m
p
o
r
t F
l
a
s
k
f
r
o
m . i
m
p
o
r
t c
a
c
h
e
f
r
o
m .
d
a
t
a i
m
p
o
r
t t
o
_
g
a
m
e
_
d
a
t
a
a
p
p = F
l
a
s
k
(
_
_
n
a
m
e
_
_
)
@
a
p
p
.
r
o
u
t
e
(
'
/
a
p
i
/
s
e
a
s
o
n
/

/
<
w
e
e
k
_
s
l
u
g
>
'
)
d
e
f r
e
t
r
i
e
v
e
_
w
e
e
k
(
s
e
a
s
o
n
_
y
e
a
r
, w
e
e
k
_
s
l
u
g
)
:
i
s
_
p
r
e
s
e
a
s
o
n = w
e
e
k
_
s
l
u
g
[
:
4
] =
= '
p
r
e
-
'
w
e
e
k = i
n
t
(
w
e
e
k
_
s
l
u
g
[
4
:
] i
f i
s
_
p
r
e
s
e
a
s
o
n e
l
s
e w
e
e
k
_
s
l
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g
)
c
a
c
h
e
_
k
e
y = c
a
c
h
e
.
b
u
i
l
d
_
k
e
y
(
s
e
a
s
o
n
_
y
e
a
r
, w
e
e
k
_
s
l
u
g
)
w
e
e
k
_
d
a
t
a = c
a
c
h
e
.
e
n
s
u
r
e
_
d
a
t
a
(
c
a
c
h
e
_
k
e
y
)
i
f w
e
e
k
_
d
a
t
a i
s N
o
n
e
:
w
e
e
k
_
o
b
j = f
e
t
c
h
_
w
e
e
k
(
s
e
a
s
o
n
_
y
e
a
r
, w
e
e
k
, i
s
_
p
r
e
s
e
a
s
o
n
)
w
e
e
k
_
d
a
t
a = [
t
o
_
g
a
m
e
_
d
a
t
a
(
g
a
m
e
) f
o
r g
a
m
e i
n w
e
e
k
_
o
b
j
.
i
t
e
r
f
i
n
d
(
'
g
m
s
/
g
'
)
]
c
a
c
h
e
.
s
t
o
r
e
_
d
a
t
a
(
c
a
c
h
e
_
k
e
y
, w
e
e
k
_
d
a
t
a
)
r
e
t
u
r
n j
s
o
n
i
f
y
(
w
e
e
k
_
d
a
t
a
)

View Slide

Step 2. Running Flask application
$ g
u
n
i
c
o
r
n -
k s
y
n
c -
w 5 -
t 6
0 a
p
p
:
a
p
p
$ g
u
n
i
c
o
r
n -
k e
v
e
n
t
l
e
t -
w 5 -
t 6
0 a
p
p
:
a
p
p

View Slide

Step 3. aiohttp.web base application
i
m
p
o
r
t u
j
s
o
n
f
r
o
m a
i
o
h
t
t
p i
m
p
o
r
t w
e
b
a
s
y
n
c d
e
f a
i
o
_
r
e
t
r
i
e
v
e
_
w
e
e
k
(
r
e
q
u
e
s
t
)
:
s
e
a
s
o
n
_
y
e
a
r = i
n
t
(
r
e
q
u
e
s
t
.
m
a
t
c
h
_
i
n
f
o
[
'
s
e
a
s
o
n
_
y
e
a
r
'
]
)
w
e
e
k
_
s
l
u
g = r
e
q
u
e
s
t
.
m
a
t
c
h
_
i
n
f
o
[
'
w
e
e
k
_
s
l
u
g
'
]
i
s
_
p
r
e
s
e
a
s
o
n = w
e
e
k
_
s
l
u
g
[
:
4
] =
= '
p
r
e
-
'
w
e
e
k = i
n
t
(
w
e
e
k
_
s
l
u
g
[
4
:
] i
f i
s
_
p
r
e
s
e
a
s
o
n e
l
s
e w
e
e
k
_
s
l
u
g
)
c
a
c
h
e
_
k
e
y = c
a
c
h
e
.
b
u
i
l
d
_
k
e
y
(
s
e
a
s
o
n
_
y
e
a
r
, w
e
e
k
, i
s
_
p
r
e
s
e
a
s
o
n
)
w
e
e
k
_
d
a
t
a = a
w
a
i
t c
a
c
h
e
.
a
i
o
_
e
n
s
u
r
e
_
d
a
t
a
(
c
a
c
h
e
_
k
e
y
)
i
f w
e
e
k
_
d
a
t
a i
s N
o
n
e
:
w
e
e
k
_
o
b
j = a
w
a
i
t a
i
o
_
f
e
t
c
h
_
w
e
e
k
(
s
e
a
s
o
n
_
y
e
a
r
, w
e
e
k
, i
s
_
p
r
e
s
e
a
s
o
n
)
w
e
e
k
_
d
a
t
a = [
t
o
_
g
a
m
e
_
d
a
t
a
(
g
a
m
e
) f
o
r g
a
m
e i
n w
e
e
k
_
o
b
j
.
i
t
e
r
f
i
n
d
(
'
g
m
s
/
g
'
)
]
a
w
a
i
t c
a
c
h
e
.
s
t
o
r
e
_
d
a
t
a
(
c
a
c
h
e
_
k
e
y
, w
e
e
k
_
d
a
t
a
)
r
e
t
u
r
n w
e
b
.
R
e
s
p
o
n
s
e
(
u
j
s
o
n
.
d
u
m
p
s
(
w
e
e
k
_
d
a
t
a
)
,
c
o
n
t
e
n
t
_
t
y
p
e
=
'
a
p
p
l
i
c
a
t
i
o
n
/
j
s
o
n
'
)

View Slide

Step 3. aiohttp.web base application (continue)
a
i
o
_
a
p
p = w
e
b
.
A
p
p
l
i
c
a
t
i
o
n
(
)
a
i
o
_
a
p
p
.
r
o
u
t
e
r
.
a
d
d
_
r
o
u
t
e
(
'
G
E
T
'
,
'
/
a
p
i
/
s
e
a
s
o
n
/
{
s
e
a
s
o
n
_
y
e
a
r
:
\
d
{
4
}
}
/
{
w
e
e
k
_
s
l
u
g
}
'
,
a
i
o
_
r
e
t
r
i
e
v
e
_
w
e
e
k
)

View Slide

aiohttp.web basics
Each view function should be a c
o
r
o
u
t
i
n
e
/a
s
y
n
c d
e
f and return response or raise an exc
Each view function receives only one arg: r
e
q
u
e
s
t
Query params data contains in r
e
q
u
e
s
t
.
G
E
T multidict
Body data contains in r
e
q
u
e
s
t
.
P
O
S
T multidict and should be awaited with a
w
a
i
t r
e
q
u
e
s
t
.
p
o
s
t
(
)
Matched data contains in r
e
q
u
e
s
t
.
m
a
t
c
h
_
i
n
f
o dict
r
e
q
u
e
s
t also contains an a
p
p instance

View Slide

Step 4. Runinng aiohttp.web application
$ g
u
n
i
c
o
r
n -
k a
i
o
h
t
t
p
.
w
o
r
k
e
r
.
G
u
n
i
c
o
r
n
W
e
b
W
o
r
k
e
r -
w 5 -
t 6
0 a
p
p
:
a
i
o
_
a
p
p

View Slide

Step 5. Resulted JSON

View Slide

Server-Sent Events

View Slide

Task. Livescore stream
When there are live games, update the scores automagically for the user
Do not reconnect each X seconds for new scores
When new scores available - show them to user
This is the case for Server-Sent Events (SSE)

View Slide

Server-Sent Events. Message Format
d
a
t
a
: H
e
l
l
o
, P
y
C
o
n F
i
n
l
a
n
d
!

e
v
e
n
t
: p
y
c
o
n
f
i
d
a
t
a
: H
e
l
l
o
, P
y
c
o
n F
i
n
l
a
n
d
!
d
a
t
a
: I
'
m g
l
a
d t
o b
e h
e
r
e

i
d
: 4
2
e
v
e
n
t
: u
a
p
y
c
o
n
d
a
t
a
: P
y
C
o
n U
k
r
a
i
n
e 2
0
1
6 w
i
l
l h
e
l
d a p
l
a
c
e i
n L
v
i
v a
t A
p
r
i
l 2
0
1
6


View Slide

Server-Sent Events. EventSource
c
o
n
s
t e
l
e
m
e
n
t = d
o
c
u
m
e
n
t
.
g
e
t
E
l
e
m
e
n
t
B
y
I
d
(
"
n
o
t
i
f
i
c
a
t
i
o
n
s
-
c
o
n
t
a
i
n
e
r
"
)
;
c
o
n
s
t s
o
u
r
c
e = n
e
w E
v
e
n
t
S
o
u
r
c
e
(
"
/
a
p
i
/
n
o
t
i
f
i
c
a
t
i
o
n
s
"
)
;
s
o
u
r
c
e
.
o
n
e
r
r
o
r = e
r
r =
> {
.
.
.
}
;
s
o
u
r
c
e
.
a
d
d
E
v
e
n
t
L
i
s
t
e
n
e
r
(
"
p
y
c
o
n
f
i
"
, e
v
t =
> {
e
l
e
m
e
n
t
.
i
n
n
e
r
H
T
M
L +
= `
<
c
o
d
e
>
#
p
y
c
o
n
f
i
<
/
c
o
d
e
> $
{
e
v
t
.
d
a
t
a
}

`
;
}
)
;
s
o
u
r
c
e
.
a
d
d
E
v
e
n
t
L
i
s
t
e
n
e
r
(
"
u
a
p
y
c
o
n
"
, e
v
t =
> {
e
l
e
m
e
n
t
.
i
n
n
e
r
H
T
M
L +
= `
<
c
o
d
e
>
#
u
a
p
y
c
o
n
<
/
c
o
d
e
> $
{
e
v
t
.
d
a
t
a
}

`
;
}
)
;
.
.
.
s
o
u
r
c
e
.
c
l
o
s
e
(
)
;

View Slide

How to implement?
1. Run script to fetch live scores and publish new scores to Redis PUBSUB
2. Subscribe to this channel in livescore stream view, receive message and push it to client
3. Subscribe to livescore stream in client and update scores when new message received
4. ...
5. PROFIT

View Slide

Step 1. Fetching & publishing scores change
d
e
f m
a
i
n
(
*
a
r
g
s
)
:
s
e
a
s
o
n
, w
e
e
k = a
r
g
s
l
o
o
p = a
s
y
n
c
i
o
.
g
e
t
_
e
v
e
n
t
_
l
o
o
p
(
)
w
e
e
k
_
o
b
j = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
a
i
o
_
f
e
t
c
h
_
w
e
e
k
(
s
e
a
s
o
n
, w
e
e
k
, F
a
l
s
e
)
)
w
e
e
k
_
d
a
t
a = [
t
o
_
g
a
m
e
_
d
a
t
a
(
g
a
m
e
) f
o
r g
a
m
e i
n w
e
e
k
_
o
b
j
.
i
t
e
r
f
i
n
d
(
'
g
m
s
/
g
'
)
]
r
e
d
i
s = l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
c
r
e
a
t
e
_
r
e
d
i
s
(
(
'
l
o
c
a
l
h
o
s
t
'
, 6
3
7
9
)
)
)
l
o
o
p
.
r
u
n
_
u
n
t
i
l
_
c
o
m
p
l
e
t
e
(
r
e
d
i
s
.
p
u
b
l
i
s
h
(
'
C
H
A
N
N
E
L
'
, u
j
s
o
n
.
d
u
m
p
s
(
w
e
e
k
_
d
a
t
a
)
)
)
l
o
o
p
.
c
l
o
s
e
(
)
r
e
t
u
r
n F
a
l
s
e
i
f _
_
n
a
m
e
_
_ =
= '
_
_
m
a
i
n
_
_
'
:
s
y
s
.
e
x
i
t
(
i
n
t
(
m
a
i
n
(
*
s
y
s
.
a
r
g
v
[
1
:
]
)
)
)

View Slide

Step 2. Implementing livescore stream
a
s
y
n
c d
e
f l
i
v
e
s
c
o
r
e
(
r
e
q
u
e
s
t
)
:
i
f r
e
q
u
e
s
t
.
h
e
a
d
e
r
s
[
'
A
c
c
e
p
t
'
] !
= '
t
e
x
t
/
e
v
e
n
t
-
s
t
r
e
a
m
'
:
r
a
i
s
e w
e
b
.
H
T
T
P
F
o
u
n
d
(
'
/
a
p
i
/
'
)
r
e
s
p
o
n
s
e = w
e
b
.
S
t
r
e
a
m
R
e
s
p
o
n
s
e
(
s
t
a
t
u
s
=
2
0
0
, h
e
a
d
e
r
s
=
{
'
C
o
n
t
e
n
t
-
T
y
p
e
'
: '
t
e
x
t
/
e
v
e
n
t
-
s
t
r
e
a
m
'
,
'
C
a
c
h
e
-
C
o
n
t
r
o
l
'
: '
n
o
-
c
a
c
h
e
'
,
'
C
o
n
n
e
c
t
i
o
n
'
: '
k
e
e
p
-
a
l
i
v
e
'
,
}
)
r
e
s
p
o
n
s
e
.
s
t
a
r
t
(
r
e
q
u
e
s
t
) # T
h
i
s w
i
l
l b
e c
h
a
n
g
e
d i
n a
s
y
n
c
i
o
=
=
0
.
1
8
.
0
.
.
.
r
e
t
u
r
n r
e
s
p
o
n
s
e

View Slide

Step 2. Subscribing to scores update
.
.
.
r
e
d
i
s = a
w
a
i
t c
r
e
a
t
e
_
r
e
d
i
s
(
(
'
l
o
c
a
l
h
o
s
t
'
, 6
3
7
9
)
)
c
h
a
n
n
e
l = (
a
w
a
i
t r
e
d
i
s
.
s
u
b
s
c
r
i
b
e
(
'
C
H
A
N
N
E
L
'
)
)
[
0
]
w
h
i
l
e (
a
w
a
i
t c
h
a
n
n
e
l
.
w
a
i
t
_
m
e
s
s
a
g
e
(
)
)
:
m
e
s
s
a
g
e = a
w
a
i
t c
h
a
n
n
e
l
.
g
e
t
(
)
r
e
s
p
o
n
s
e
.
w
r
i
t
e
(
b
'
e
v
e
n
t
: u
p
d
a
t
e
\
r
\
n
'
)
r
e
s
p
o
n
s
e
.
w
r
i
t
e
(
b
'
d
a
t
a
: ' + m
e
s
s
a
g
e + b
'
\
r
\
n
\
r
\
n
'
)
.
.
.

View Slide

Step 2. Registering stream to the app
a
i
o
_
a
p
p
.
r
o
u
t
e
r
.
a
d
d
_
r
o
u
t
e
(
'
G
E
T
'
, '
/
a
p
i
/
l
i
v
e
s
c
o
r
e
'
, l
i
v
e
s
c
o
r
e
)

View Slide

Step 3. Subscribing to livescore stream on client
i
m
p
o
r
t R
e
a
c
t
, {
C
o
m
p
o
n
e
n
t
} f
r
o
m "
r
e
a
c
t
"
;
e
x
p
o
r
t d
e
f
a
u
l
t A
p
p e
x
t
e
n
d
s C
o
m
p
o
n
e
n
t {
l
i
v
e
S
c
o
r
e = n
u
l
l
;
c
o
n
s
t
r
u
c
t
o
r
(
p
r
o
p
s
) {
s
u
p
e
r
(
p
r
o
p
s
)
;
t
h
i
s
.
s
t
a
t
e = {
g
a
m
e
s
: p
r
o
p
s
.
g
a
m
e
s
}
;
}
c
o
m
p
o
n
e
n
t
D
i
d
M
o
u
n
t
(
) {
t
h
i
s
.
l
i
v
e
S
c
o
r
e = n
e
w E
v
e
n
t
S
o
u
r
c
e
(
"
/
a
p
i
/
"
)
;
t
h
i
s
.
l
i
v
e
S
c
o
r
e
.
a
d
d
E
v
e
n
t
L
i
s
t
e
n
e
r
(
"
u
p
d
a
t
e
"
, e
v
t =
> {
t
h
i
s
.
s
e
t
S
t
a
t
e
(
{
g
a
m
e
s
: J
S
O
N
.
p
a
r
s
e
(
e
v
t
.
d
a
t
a
)
}
)
;
}
)
;
}
c
o
m
p
o
n
e
n
t
W
i
l
l
U
n
m
o
u
n
t
(
) {
t
h
i
s
.
l
i
v
e
S
c
o
r
e
.
c
l
o
s
e
(
)
;
}
r
e
n
d
e
r
(
) {
r
e
t
u
r
n
}
}
<
G
a
m
e
s d
a
t
a
=
{
t
h
i
s
.
s
t
a
t
e
.
g
a
m
e
s
} /
>
;

View Slide

Step 4. Setting up the nginx
l
o
c
a
t
i
o
n /
a
p
i
/
l
i
v
e
s
c
o
r
e {
c
h
u
n
k
e
d
_
t
r
a
n
s
f
e
r
_
e
n
c
o
d
i
n
g o
f
f
;
p
r
o
x
y
_
b
u
f
f
e
r
i
n
g o
f
f
;
p
r
o
x
y
_
c
a
c
h
e o
f
f
;
p
r
o
x
y
_
h
t
t
p
_
v
e
r
s
i
o
n 1
.
1
;
p
r
o
x
y
_
p
a
s
s h
t
t
p
:
/
/
1
2
7
.
0
.
0
.
1
:
8
0
0
0
;
p
r
o
x
y
_
s
e
t
_
h
e
a
d
e
r C
o
n
n
e
c
t
i
o
n '
'
;
p
r
o
x
y
_
s
e
t
_
h
e
a
d
e
r H
o
s
t $
h
o
s
t
;
p
r
o
x
y
_
s
e
t
_
h
e
a
d
e
r X
-
R
e
a
l
-
I
P $
r
e
m
o
t
e
_
a
d
d
r
;
p
r
o
x
y
_
s
e
t
_
h
e
a
d
e
r X
-
F
o
r
w
a
r
d
e
d
-
F
o
r $
p
r
o
x
y
_
a
d
d
_
x
_
f
o
r
w
a
r
d
e
d
_
f
o
r
;
}

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Step 5. It works

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async/await era
Conclusion

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The Future is Here
Python 3.5 released and ready to be used in production
Python 3.5 contains new a
s
y
n
c
/a
w
a
i
t statements
a
s
y
n
c
i
o stack got great addition, code now is simple to read and understand
asyncio stack (for web applications):
a
i
o
h
t
t
p – interact with remote API
a
i
o
h
t
t
p
.
w
e
b – create API backends
a
i
o
p
g – interact with PostgreSQL (DB)
a
i
o
r
e
d
i
s – interact with Redis (cache)

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The Future is Here
a
s
y
n
c
i
o stack is a great reason why you'll finally need to switch to Python 3
a
s
y
n
c
i
o is good fit for:
Database-less API
Requesting remote API
Async code execution
Predictable async I/O
And I'm not telling you about WebSockets, which supported by a
i
o
h
t
t
p out of the box

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And the real reason of
using asyncio

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Cause it cool and trendy!

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Questions?

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Bonus. PyCon Ukraine 2016
April 2016
Lviv, Ukraine
Related activities
Looking for speakers: @hotsyk

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Welcome to async/await era

Welcome to async/await era

Igor Davydenko

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