jplephem/daf.py
def map_words(self, start, end):
        """Return a memory-map of the elements `start` through `end`.

        The memory map will offer the 8-byte double-precision floats
        ("elements") in the file from index `start` through to the index
        `end`, inclusive, both counting the first float as element 1.
        Memory maps must begin on a page boundary, so `skip` returns the
        number of extra bytes at the beginning of the return value.

        """
        i, j = 8 * start - 8, 8 * end
        try:
            fileno = self.file.fileno()
        except (AttributeError, io.UnsupportedOperation):
            fileno = None
        if fileno is None:
            skip = 0
            self.file.seek(i)
            m = self.file.read(j - i)
        else:
            skip = i % mmap.ALLOCATIONGRANULARITY
            r = mmap.ACCESS_READ
            m = mmap.mmap(fileno, length=j-i+skip, access=r, offset=i-skip)
        if sys.version_info > (3,):
            m = memoryview(m)  # so further slicing can return views
        return m, skip
def map_words(self, start, end):
        i, j = 8 * start - 8, 8 * end
        try:
            fileno = self.file.fileno()
        except (AttributeError, io.UnsupportedOperation):
            fileno = None
        if fileno is None:
            skip = 0
            self.file.seek(i)
            m = self.file.read(j - i)
        else:
            skip = i % mmap.ALLOCATIONGRANULARITY
            r = mmap.ACCESS_READ
            m = mmap.mmap(fileno, length=j-i+skip, access=r, offset=i-skip)
        if sys.version_info > (3,):
            m = memoryview(m)  # so further slicing can return views
        return m, skip
def map_words ( self , start , end ) : i , j = 8 * start - 8 , 8 * end try : fileno = self . file . fileno ( ) except ( AttributeError , io . UnsupportedOperation ) : fileno = None if fileno is None : skip = 0 self . file . seek ( i ) m = self . file . read ( j - i ) else : skip = i % mmap . ALLOCATIONGRANULARITY r = mmap . ACCESS_READ m = mmap . mmap ( fileno , length = j - i + skip , access = r , offset = i - skip ) if sys . version_info > ( 3 , ) : m = memoryview ( m ) # so further slicing can return views return m , skip
Return a memory-map of the elements `start` through `end`.

        The memory map will offer the 8-byte double-precision floats
        ("elements") in the file from index `start` through to the index
        `end`, inclusive, both counting the first float as element 1.
        Memory maps must begin on a page boundary, so `skip` returns the
        number of extra bytes at the beginning of the return value.
Return a memory - map of the elements start through end .