looking for blocking on read of a real file (not socket or pipe)

[Steven]

Hello,
I'm seeking a read method that will block until new data is available. Is
there such a python function that does that?

Thanks,

Steven Howe

 

[Fredrik Lundh]

I'm seeking a read method that will block until new data is available. Is
there such a python function that does that?

read until end of file, wait a while, seek to position you tried to read from
when you reached the end, and read again. see:

http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/157035

(also see the comments, but ignore the last one; he is missing something)

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[Peter Hansen]

I'm seeking a read method that will block until new data is available. Is
there such a python function that does that?

It may be relevant which platform(s) are of interest. Linux?
Mac? Windows? All? The more cross-platform this needs to
be, the less likely it exists...

 

[elbertlev]

I doubt that the recipe you recomended will work at all in the case of
different processes. To do this right file has to be open in shared
mode (by both programs). Python does not support shared access.
In the case of one program, but different threads probably this will
work.

 

[Fredrik Lundh]

I doubt that the recipe you recomended will work at all in the case of
different processes. To do this right file has to be open in shared
mode (by both programs). Python does not support shared access.
In the case of one program, but different threads probably this will
work.

do you always assume that everyone uses the same operating system as
you do? (even if the user agent they used to post the message doesn't run
on your operating system... ;-)

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