parameters: (self, filename=None, mode=None,
                   compresslevel=9, fileobj=None)
docstring: Constructor for the GzipFile class.
  
          At least one of fileobj and filename must be given a
          non-trivial value.
  
          The new class instance is based on fileobj, which can be a regular
          file, a StringIO object, or any other object which simulates a file.
          It defaults to None, in which case filename is opened to provide
          a file object.
  
          When fileobj is not None, the filename argument is only used to be
          included in the gzip file header, which may includes the original
          filename of the uncompressed file.  It defaults to the filename of
          fileobj, if discernible; otherwise, it defaults to the empty string,
          and in this case the original filename is not included in the header.
  
          The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', or 'wb',
          depending on whether the file will be read or written.  The default
          is the mode of fileobj if discernible; otherwise, the default is 'rb'.
          Be aware that only the 'rb', 'ab', and 'wb' values should be used
          for cross-platform portability.
  
          The compresslevel argument is an integer from 1 to 9 controlling the
          level of compression; 1 is fastest and produces the least compression,
          and 9 is slowest and produces the most compression.  The default is 9.
docstring_summary: Constructor for the GzipFile class.
docstring_tokens: Constructor for the GzipFile class .
function: def __init__(self, filename=None, mode=None,
                   compresslevel=9, fileobj=None):
          """Constructor for the GzipFile class.
  
          At least one of fileobj and filename must be given a
          non-trivial value.
  
          The new class instance is based on fileobj, which can be a regular
          file, a StringIO object, or any other object which simulates a file.
          It defaults to None, in which case filename is opened to provide
          a file object.
  
          When fileobj is not None, the filename argument is only used to be
          included in the gzip file header, which may includes the original
          filename of the uncompressed file.  It defaults to the filename of
          fileobj, if discernible; otherwise, it defaults to the empty string,
          and in this case the original filename is not included in the header.
  
          The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', or 'wb',
          depending on whether the file will be read or written.  The default
          is the mode of fileobj if discernible; otherwise, the default is 'rb'.
          Be aware that only the 'rb', 'ab', and 'wb' values should be used
          for cross-platform portability.
  
          The compresslevel argument is an integer from 1 to 9 controlling the
          level of compression; 1 is fastest and produces the least compression,
          and 9 is slowest and produces the most compression.  The default is 9.
  
          """
  
          # guarantee the file is opened in binary mode on platforms
          # that care about that sort of thing
          if mode and 'b' not in mode:
              mode += 'b'
          if fileobj is None:
              fileobj = self.myfileobj = __builtin__.open(filename, mode or 'rb')
          if filename is None:
              if hasattr(fileobj, 'name'): filename = fileobj.name
              else: filename = ''
          if mode is None:
              if hasattr(fileobj, 'mode'): mode = fileobj.mode
              else: mode = 'rb'
  
          if mode[0:1] == 'r':
              self.mode = READ
              # Set flag indicating start of a new member
              self._new_member = True
              self.extrabuf = ""
              self.extrasize = 0
              self.name = filename
              # Starts small, scales exponentially
              self.min_readsize = 100
  
          elif mode[0:1] == 'w' or mode[0:1] == 'a':
              self.mode = WRITE
              self._init_write(filename)
              self.compress = zlib.compressobj(compresslevel,
                                               zlib.DEFLATED,
                                               -zlib.MAX_WBITS,
                                               zlib.DEF_MEM_LEVEL,
                                               0)
          else:
              raise IOError, "Mode " + mode + " not supported"
  
          self.fileobj = fileobj
          self.offset = 0
  
          if self.mode == WRITE:
              self._write_gzip_header()
function_tokens: def __init__ ( self , filename = None , mode = None , compresslevel = 9 , fileobj = None ) : # guarantee the file is opened in binary mode on platforms # that care about that sort of thing if mode and 'b' not in mode : mode += 'b' if fileobj is None : fileobj = self . myfileobj = __builtin__ . open ( filename , mode or 'rb' ) if filename is None : if hasattr ( fileobj , 'name' ) : filename = fileobj . name else : filename = '' if mode is None : if hasattr ( fileobj , 'mode' ) : mode = fileobj . mode else : mode = 'rb' if mode [ 0 : 1 ] == 'r' : self . mode = READ # Set flag indicating start of a new member self . _new_member = True self . extrabuf = "" self . extrasize = 0 self . name = filename # Starts small, scales exponentially self . min_readsize = 100 elif mode [ 0 : 1 ] == 'w' or mode [ 0 : 1 ] == 'a' : self . mode = WRITE self . _init_write ( filename ) self . compress = zlib . compressobj ( compresslevel , zlib . DEFLATED , - zlib . MAX_WBITS , zlib . DEF_MEM_LEVEL , 0 ) else : raise IOError , "Mode " + mode + " not supported" self . fileobj = fileobj self . offset = 0 if self . mode == WRITE : self . _write_gzip_header ( )