Iterating over a binary file

[Jp Calderone]

On Tue, Jan 06, 2004 at 03:25:11PM -0500, Derek wrote:
> Pardon the newbie question, but how can I iterate over blocks of data
> from a binary file (i.e., I can't just iterate over lines, because
> there may be no end-of-line delimiters at all).  Essentially I want to
> to this:
> 
> f = file(filename, 'rb')
> data = f.read(1024)
> while len(data) > 0:
>     someobj.update(data)
>     data = f.read(1024)
> f.close()
> 
> The above code works, but I don't like making two read() calls.  Any
> way to avoid it, or a more elegant syntax?  Thanks.
> 

      f = file(filename, 'rb')                                                                                                                                          
      for data in iter(lambda: f.read(1024), ''):                                                                                                                       
        someobj.update(data)                                                                                                                                            
      f.close()                                                                                                                                                         
                                                                                                                                                                        
  Jp