savez(file, *args, **kwds)¶
Save several arrays into a single file in uncompressed
If arguments are passed in with no keywords, the corresponding variable names, in the
.npzfile, are ‘arr_0’, ‘arr_1’, etc. If keyword arguments are given, the corresponding variable names, in the
.npzfile will match the keyword names.
file (str or file) – Either the filename (string) or an open file (file-like object) where the data will be saved. If file is a string or a Path, the
.npzextension will be appended to the filename 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.
- Return type
Save a single array to a binary file in NumPy format.
Save an array to a file as plain text.
Save several arrays into a compressed
.npzfile 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
.npyformat. For a description of the
When opening the saved
.npzfile with load a NpzFile object is returned. This is a dictionary-like object which can be queried for its list of arrays (with the
.filesattribute), and for the arrays themselves.
When saving dictionaries, the dictionary keys become filenames inside the ZIP archive. Therefore, keys should be valid filenames. E.g., avoid keys that begin with
>>> 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_0', 'arr_1'] >>> 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) >>> sorted(npzfile.files) ['x', 'y'] >>> npzfile['x'] array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])