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Groups > it.comp.lang.python > #7642
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| From | pecore@pascolo.org |
| Newsgroups | it.comp.lang.python |
| Subject | Re: Copiare file "a pezzi" |
| Date | Tue, 19 Apr 2016 01:15:12 +0200 |
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MB339A <Freccetricolori@tin.it> writes:
> #!/usr/bin/python
> import os
>
> blocksize=500000
>
> lenf=os.path.getsize("m2_1958.raw")
> ncycles=lenf / blocksize
> rest=lenf % blocksize
> inf = open('m2_1958.raw', 'rb')
> outf = open('m2_1958.wav', 'wb')
>
> for i in range (1,ncycles):
> bread = inf.read(blocksize)
> outf.write(bread)
> print('*'),
> inf.close()
> outf.close()
non è indispensabile sapere la lunghezza del file da copiare, il buffer
che leggi è vuoto solo se hai già raggiunto la fine del file
with open('m2_1958.raw', 'rb') as inf, open('m2_1958.wav', 'wb') as ouf:
while True:
buf = inf.read(blksz)
if buf:
ouf.write(buf) ; print('*', end='', flush=True)
else:
print() ; break
se usi python 3 o usi `from __future__ import print_function` puoi
usare degli argomenti opzionali per modificare in maniera autoevidente
il comportamenteo di `print`
se usi `with`, quando esci dal suo blocco i file aperti vengono chiusi
automaticamente
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Copiare file "a pezzi" MB339A <Freccetricolori@tin.it> - 2016-03-21 21:46 +0100 Re: Copiare file "a pezzi" MB339A <Freccetricolori@tin.it> - 2016-03-21 22:29 +0100 Re: Copiare file "a pezzi" pecore@pascolo.org - 2016-04-19 01:15 +0200
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