Python: Creating a streaming gzip'd file-like? -


I try to figure out the best way to insert a stream with Python's zlib I am here.

I have file-like input stream ( input , below) and output function which accepts file-like ( output_function , below) Is:

and I with gzip-compress input

and open as input ("file") : 

  Before sending: output_function (gzip_stream (input))  with input ("file") as input ()  >

It seems that the module assumes that either input or output is a gzip'd file- Not-be disc ... So am I module I want.

However, it does not provide a simple way to basically create a stream file like ... and it supports stream-compression manually in the way of adding data to a compression buffer Now it is flushing that buffer.

Of course, I could write a cover around zlib.Compress.compress and zlib.Compress.flush ( narrow it zlib.compressobj () ), but I must be worried about having a buffer size incorrect, or something similar.

So, what's the easiest way to create streaming, jesus-compressing files-with Python?

Edit : In order to make it clear, both input stream and compressed output stream are too big to fit in both memory, so output_function (StringIO (zlib.compress (Input.

This is quite a cool (self-reference, etc.); just put a few minutes to write it, Nothing is actually elegant), but if you are still interested in using gzip instead of zlib what do you want Yes.

Actually, GzipWrap is a (very limited) file-like object that is given a given iterative (e.g., a file-like object, a list of strings, a generator ...)

Of course, it produces binary, so there was no point in applying "readline".

You should cover it or use it To be able to extend the gizip import GzipFile class from GzipWrap (object) 

  only one As Bjekt: # input is a file object which input Diaf __init __ (self, input file name = no) feeds himself. Input = input self.buffer = '' self.zipper = GzipFile (file name, mode = 'wb', fileobj = self) def (self, size = -1): if (size = lt; 0) or lane Auto buffer) & lt; Size: for self.input in: self.zipper.write (s) Size & gt; 0 more lane (auto buffer) & gt; = Size: self.zipper.flush () Break: self.zipper.close () If size & lt; 0: ret = self.buffer self.buffer = '' else: ret, self.buffer = self.buffer [: shape], self.buffer [size:] ret ret ret flush (self): pass def write (self, Data): self.buffer + = data off of DRF (self): self.input.close ()

Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more

Debug on symbian -

I am using trk for phone debug This works well for the Holorld project But when I start the project in phone debug mode 1) the load failed 2) TrkProtocolPlugin: to target the specified file Failure (please verify If any body understands what problem I am experiencing, then this problem helps me Pre-release If the application has the privileges assigned (with the appropriate certificate) itemprop = "text" > In your case, I will check: / li> If there is no conflict of application ID with any other application of device If there are problematic commands in the installation package (for example copy copy for non-accessible directories)
Read more