load(file, mmap_mode=None, allow_pickle=False, fix_imports=True, encoding='ASCII')
module, which is not secure against erroneous or maliciously constructed data. Consider passing allow_pickle=False
to load data that is known not to contain object arrays for the safer handling of untrusted sources.
If the file contains pickle data, then whatever object is stored in the pickle is returned.
If the file is a .npy
file, then a single array is returned.
If the file is a .npz
file, then a dictionary-like object is returned, containing {filename: array}
key-value pairs, one for each file in the archive.
If the file is a .npz
file, the returned value supports the context manager protocol in a similar fashion to the open function:
with load('foo.npz') as data:
a = data['a']
The underlying file descriptor is closed when exiting the 'with' block.
The file to read. File-like objects must support the seek()
and read()
methods. Pickled files require that the file-like object support the readline()
method as well.
If not None, then memory-map the file, using the given mode (see numpy.memmap
for a detailed description of the modes). A memory-mapped array is kept on disk. However, it can be accessed and sliced like any ndarray. Memory mapping is especially useful for accessing small fragments of large files without reading the entire file into memory.
Allow loading pickled object arrays stored in npy files. Reasons for disallowing pickles include security, as loading pickled data can execute arbitrary code. If pickles are disallowed, loading object arrays will fail. Default: False
Made default False in response to CVE-2019-6446.
Only useful when loading Python 2 generated pickled files on Python 3, which includes npy/npz files containing object arrays. If :None:None:`fix_imports` is True, pickle will try to map the old Python 2 names to the new names used in Python 3.
What encoding to use when reading Python 2 strings. Only useful when loading Python 2 generated pickled files in Python 3, which includes npy/npz files containing object arrays. Values other than 'latin1', 'ASCII', and 'bytes' are not allowed, as they can corrupt numerical data. Default: 'ASCII'
If the input file does not exist or cannot be read.
If allow_pickle=True
, but the file cannot be loaded as a pickle.
The file contains an object array, but allow_pickle=False
given.
Data stored in the file. For .npz
files, the returned instance of NpzFile class must be closed to avoid leaking file descriptors.
Load arrays or pickled objects from .npy
, .npz
or pickled files.
lib.format.open_memmap
Create or load a memory-mapped .npy
file.
memmap
Create a memory-map to an array stored in a file on disk.
Store data to disk, and load it again:
>>> np.save('/tmp/123', np.array([[1, 2, 3], [4, 5, 6]]))
... np.load('/tmp/123.npy') array([[1, 2, 3], [4, 5, 6]])
Store compressed data to disk, and load it again:
>>> a=np.array([[1, 2, 3], [4, 5, 6]])
... b=np.array([1, 2])
... np.savez('/tmp/123.npz', a=a, b=b)
... data = np.load('/tmp/123.npz')
... data['a'] array([[1, 2, 3], [4, 5, 6]])
>>> data['b'] array([1, 2])
>>> data.close()
Mem-map the stored array, and then access the second row directly from disk:
>>> X = np.load('/tmp/123.npy', mmap_mode='r')See :
... X[1, :] memmap([4, 5, 6])
The following pages refer to to this document either explicitly or contain code examples using this.
numpy.fromfile
scipy.sparse._matrix_io.load_npz
numpy.loadtxt
numpy.savez_compressed
matplotlib.cbook.get_sample_data
numpy.savez
numpy.save
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