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This repository was archived by the owner on Dec 2, 2021. It is now read-only.

Commiteeb6b3d

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some chapter 17 examples updated for Python 3.7
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‎.gitignore‎

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.vscode/
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.venv3?/
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*.sublime-project
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*.sublime-workspace
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.env*

‎17-futures-py3.7/README.rst‎

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Updated sample code for Chapter 17 - "Concurrency with futures"
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From the book "Fluent Python" by Luciano Ramalho (O'Reilly, 2015)
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http://shop.oreilly.com/product/0636920032519.do
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This directory contains code updated to run with Python 3.7 and
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**aiohttp** 3.5. When the first edition of "Fluent Python" was
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written, the **asyncio** package was provisional, and the latest
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version of **aiohttp** was 0.13.1. The API for both packages had
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significant breaking changes.
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"""Download flags of top 20 countries by population
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Sequential version
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Sample run::
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$ python3 flags.py
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BD BR CD CN DE EG ET FR ID IN IR JP MX NG PH PK RU TR US VN
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20 flags downloaded in 5.49s
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"""
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# BEGIN FLAGS_PY
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importos
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importtime
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importsys
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importrequests# <1>
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POP20_CC= ('CN IN US ID BR PK NG BD RU JP '
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'MX PH VN ET EG DE IR TR CD FR').split()# <2>
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BASE_URL='http://flupy.org/data/flags'# <3>
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DEST_DIR='downloads/'# <4>
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defsave_flag(img,filename):# <5>
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path=os.path.join(DEST_DIR,filename)
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withopen(path,'wb')asfp:
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fp.write(img)
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defget_flag(cc):# <6>
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url='{}/{cc}/{cc}.gif'.format(BASE_URL,cc=cc.lower())
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resp=requests.get(url)
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returnresp.content
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defshow(text):# <7>
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print(text,end=' ')
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sys.stdout.flush()
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defdownload_many(cc_list):# <8>
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forccinsorted(cc_list):# <9>
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image=get_flag(cc)
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show(cc)
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save_flag(image,cc.lower()+'.gif')
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returnlen(cc_list)
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defmain():# <10>
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t0=time.time()
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count=download_many(POP20_CC)
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elapsed=time.time()-t0
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msg='\n{} flags downloaded in {:.2f}s'
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print(msg.format(count,elapsed))
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if__name__=='__main__':
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main()
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# END FLAGS_PY
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"""Download flags of top 20 countries by population
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asyncio + aiottp version
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Sample run::
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$ python3 flags_asyncio.py
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CN EG BR IN ID RU NG VN JP DE TR PK FR ET MX PH US IR CD BD
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20 flags downloaded in 0.35s
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"""
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# BEGIN FLAGS_ASYNCIO
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importos
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importtime
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importsys
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importasyncio# <1>
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importaiohttp# <2>
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POP20_CC= ('CN IN US ID BR PK NG BD RU JP '
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'MX PH VN ET EG DE IR TR CD FR').split()
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BASE_URL='http://flupy.org/data/flags'
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DEST_DIR='downloads/'
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defsave_flag(img,filename):
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path=os.path.join(DEST_DIR,filename)
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withopen(path,'wb')asfp:
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fp.write(img)
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asyncdefget_flag(session,cc):# <3>
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url='{}/{cc}/{cc}.gif'.format(BASE_URL,cc=cc.lower())
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asyncwithsession.get(url)asresp:# <4>
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returnawaitresp.read()# <5>
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defshow(text):
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print(text,end=' ')
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sys.stdout.flush()
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asyncdefdownload_one(session,cc):# <6>
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image=awaitget_flag(session,cc)# <7>
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show(cc)
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save_flag(image,cc.lower()+'.gif')
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returncc
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asyncdefdownload_many(cc_list):
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asyncwithaiohttp.ClientSession()assession:# <8>
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res=awaitasyncio.gather(# <9>
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*[asyncio.create_task(download_one(session,cc))
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forccinsorted(cc_list)])
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returnlen(res)
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defmain():# <10>
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t0=time.time()
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count=asyncio.run(download_many(POP20_CC))
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elapsed=time.time()-t0
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msg='\n{} flags downloaded in {:.2f}s'
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print(msg.format(count,elapsed))
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if__name__=='__main__':
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main()
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# END FLAGS_ASYNCIO
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"""Download flags of top 20 countries by population
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ThreadPoolExecutor version
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Sample run::
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$ python3 flags_threadpool.py
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DE FR BD CN EG RU IN TR VN ID JP BR NG MX PK ET PH CD US IR
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20 flags downloaded in 0.35s
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"""
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# BEGIN FLAGS_THREADPOOL
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importos
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importtime
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importsys
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fromconcurrentimportfutures# <1>
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importrequests
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POP20_CC= ('CN IN US ID BR PK NG BD RU JP '
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'MX PH VN ET EG DE IR TR CD FR').split()
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BASE_URL='http://flupy.org/data/flags'
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DEST_DIR='downloads/'
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MAX_WORKERS=20# <2>
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defsave_flag(img,filename):
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path=os.path.join(DEST_DIR,filename)
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withopen(path,'wb')asfp:
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fp.write(img)
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defget_flag(cc):
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url='{}/{cc}/{cc}.gif'.format(BASE_URL,cc=cc.lower())
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resp=requests.get(url)
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returnresp.content
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defshow(text):
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print(text,end=' ')
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sys.stdout.flush()
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defdownload_one(cc):# <3>
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image=get_flag(cc)
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show(cc)
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save_flag(image,cc.lower()+'.gif')
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returncc
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defdownload_many(cc_list):
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workers=min(MAX_WORKERS,len(cc_list))# <4>
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withfutures.ThreadPoolExecutor(workers)asexecutor:# <5>
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res=executor.map(download_one,sorted(cc_list))# <6>
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returnlen(list(res))# <7>
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defmain():# <10>
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t0=time.time()
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count=download_many(POP20_CC)
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elapsed=time.time()-t0
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msg='\n{} flags downloaded in {:.2f}s'
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print(msg.format(count,elapsed))
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if__name__=='__main__':
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main()
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# END FLAGS_THREADPOOL
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requests==2.21.0
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aiohttp==3.5.4
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"""
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Experiment with ``ThreadPoolExecutor.map``
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"""
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# BEGIN EXECUTOR_MAP
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fromtimeimportsleep,strftime
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fromconcurrentimportfutures
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defdisplay(*args):# <1>
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print(strftime('[%H:%M:%S]'),end=' ')
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print(*args)
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defloiter(n):# <2>
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msg='{}loiter({}): doing nothing for {}s...'
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display(msg.format('\t'*n,n,n))
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sleep(n)
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msg='{}loiter({}): done.'
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display(msg.format('\t'*n,n))
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returnn*10# <3>
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defmain():
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display('Script starting.')
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executor=futures.ThreadPoolExecutor(max_workers=3)# <4>
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results=executor.map(loiter,range(5))# <5>
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display('results:',results)# <6>.
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display('Waiting for individual results:')
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fori,resultinenumerate(results):# <7>
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display('result {}: {}'.format(i,result))
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main()
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# END EXECUTOR_MAP

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