[Python] python threads, how to store results from a multithread code

[Manlio Perillo]

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Il 09/12/2011 21:18, Massimo Di Stefano ha scritto:
> Ciao,
> 
> sto provando ad imparare ad usare la libreria thread … ma ho dei problemi :-( 
> 
> il mio obiettivo e'  il download di alcuni file da internet con urlib 
> salvarli in un file temporaneo 
> e scrivere in una lista il path di tali file.
> 
> is codice di seguito, e'  scarica i file e li salva come file temporanei
> … ma non riesco a capire come salvarne una lista dei path.
> 
> ########################################################################################
> # thread test
> 
> import threading
> import urllib
> from tempfile import NamedTemporaryFile
> 
> class download(threading.Thread):
>     def __init__(self, sitecode):
>         threading.Thread.__init__(self)
>         self.sitecode = sitecode
>         self.status = -1
> 		
>     def run(self):
>         #global filelist
>         #filelist = []
>         url = 'http://waterdata.usgs.gov/nwis/monthly?referred_module=sw&site_no='
>         url += self.sitecode 
>         url += '&PARAmeter_cd=00060&partial_periods=on&format=rdb&submitted_form=parameter_selection_list'
>         tmp = NamedTemporaryFile(delete=False)
>         urllib.urlretrieve(url, tmp.name)
>         print 'loaded Monthly data for sitecode : ',  self.sitecode 
>         #filelist.append(tmp.name)
>         #return filelist
> 		
> 
> 
> sitecodelist = ['01046500', '01018500', '01010500', '01034500', '01059000', '01066000', '01100000']
> 
> for k in sitecodelist:
>     get_data = download(k)
>     get_data.start()
> 

Se preferisci restituire filelist dal thread, allora devi fare il join
di ciascun thread:

tasks = []
for k in sitecodelist:
    thread = download(k)
    tasks.append(thread)

    thread.start()

filelist = [thread.join() for thread in tasks]
print filelist


> [...]


Ciao  Manlio
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