On 2009-03-18, Grant Edwards <gra...@visi.com> wrote:
> On 2009-03-17, Jim Garrison <jgarri...@troux.com> wrote:
>> I'm an experienced C/Java/Perl developer learning Python.
>>
>> What's the canonical Python way of implementing this pseudocode?
>>
>> String buf
>> File f
>> while ((buf=f.read(10000)).length() > 0)
>> {
>> do something....
>> }
>>
>> In other words, I want to read a potentially large file in 10000 byte
>> chunks (or some other suitably large chunk size). Since the Python
>> 'file' object implements __next__() only in terms of lines (even,
>> it seems, for files opened in binary mode) I can't see how to use
>> the Python for statement in this context.
>>
>> Am I missing something basic, or is this the canonical way:
>>
>> with open(filename,"rb") as f:
>> buf = f.read(10000)
>> while len(buf) > 0
>> # do something....
>> buf = f.read(10000)
>
> with open(filename,"rb") as f:
> buf = f.read(10000)
> if not f: break
> # do something
Ow! Botched that in a couple ways....
with open(filename,"rb") as f:
while True:
buf = f.read(10000)
if not buf: break
# do something
--
Grant
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