-
numpy.savez(file, *args, **kwds)
[source] -
Save several arrays into a single file in uncompressed
.npz
format.If arguments are passed in with no keywords, the corresponding variable names, in the
.npz
file, are ?arr_0?, ?arr_1?, etc. If keyword arguments are given, the corresponding variable names, in the.npz
file will match the keyword names.Parameters: file : str or file
Either the file name (string) or an open file (file-like object) where the data will be saved. If file is a string, the
.npz
extension will be appended to the file name if it is not already there.args : Arguments, optional
Arrays to save to the file. Since it is not possible for Python to know the names of the arrays outside
savez
, the arrays will be saved with names ?arr_0?, ?arr_1?, and so on. These arguments can be any expression.kwds : Keyword arguments, optional
Arrays to save to the file. Arrays will be saved in the file with the keyword names.
Returns: None
See also
-
save
- Save a single array to a binary file in NumPy format.
-
savetxt
- Save an array to a file as plain text.
-
savez_compressed
- Save several arrays into a compressed
.npz
archive
Notes
The
.npz
file format is a zipped archive of files named after the variables they contain. The archive is not compressed and each file in the archive contains one variable in.npy
format. For a description of the.npy
format, seenumpy.lib.format
or the Numpy Enhancement Proposal http://docs.scipy.org/doc/numpy/neps/npy-format.htmlWhen opening the saved
.npz
file withload
aNpzFile
object is returned. This is a dictionary-like object which can be queried for its list of arrays (with the.files
attribute), and for the arrays themselves.Examples
>>> from tempfile import TemporaryFile >>> outfile = TemporaryFile() >>> x = np.arange(10) >>> y = np.sin(x)
Using
savez
with *args, the arrays are saved with default names.>>> np.savez(outfile, x, y) >>> outfile.seek(0) # Only needed here to simulate closing & reopening file >>> npzfile = np.load(outfile) >>> npzfile.files ['arr_1', 'arr_0'] >>> npzfile['arr_0'] array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
Using
savez
with **kwds, the arrays are saved with the keyword names.>>> outfile = TemporaryFile() >>> np.savez(outfile, x=x, y=y) >>> outfile.seek(0) >>> npzfile = np.load(outfile) >>> npzfile.files ['y', 'x'] >>> npzfile['x'] array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
-
numpy.savez()
2017-01-10 18:18:36
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