The gzip module
This module allows you to read and write gzip-compressed files as if they were ordinary files.
# File: gzip-example-1.py import gzip file = gzip.GzipFile("samples/sample.gz") print file.read()
Well it certainly looks as though we're in for a splendid afternoon's sport in this the 127th Upperclass Twit of the Year Show.
The standard implementation doesn’t support the seek and tell methods. The following example shows how to add forward seeking:
# File: gzip-example-2.py import gzip class gzipFile(gzip.GzipFile): # adds seek/tell support to GzipFile offset = 0 def read(self, size=None): data = gzip.GzipFile.read(self, size) self.offset = self.offset + len(data) return data def seek(self, offset, whence=0): # figure out new position (we can only seek forwards) if whence == 0: position = offset elif whence == 1: position = self.offset + offset else: raise IOError, "Illegal argument" if position < self.offset: raise IOError, "Cannot seek backwards" # skip forward, in 16k blocks while position > self.offset: if not self.read(min(position - self.offset, 16384)): break def tell(self): return self.offset # # try it file = gzipFile("samples/sample.gz") file.seek(80) print file.read()
this the 127th Upperclass Twit of the Year Show.