DataSource.exists(path)

memmap.flush()

ndarray.tofile(fid, sep="", format="%s") Write array to a file as text or binary (default). Data is always written

numpy.genfromtxt(fname, dtype=, comments='#', delimiter=None, skip_header=0, skip_footer=0, converters=None, missing_values=None, filling_values=None

numpy.fromstring(string, dtype=float, count=-1, sep='') A new 1-D array initialized from raw binary or text data in a string