numpy.copy#

numpy.copy(a, order='K', subok=False)[source]#

Return an array copy of the given object.

Parameters:

aarray_like

Input data.

order{C, F, A, K}, optional

Controls the memory layout of the copy. C means C-order, F means F-order, A means F if a is Fortran contiguous, C otherwise. K means match the layout of a as closely as possible. (Note that this function and ndarray.copy are very similar, but have different default values for their order= arguments.)

subokbool, optional

If True, then sub-classes will be passed-through, otherwise the returned array will be forced to be a base-class array (defaults to False).

Returns:

arrndarray

Array interpretation of a.

See also

ndarray.copy

Preferred method for creating an array copy

Notes

This is equivalent to:

>>> np.array(a, copy=True)  

The copy made of the data is shallow, i.e., for arrays with object dtype, the new array will point to the same objects. See Examples from ndarray.copy.

Examples

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>>> import numpy as np

Create an array x, with a reference y and a copy z:

>>> x = np.array([1, 2, 3])
>>> y = x
>>> z = np.copy(x)

Note that, when we modify x, y changes, but not z:

>>> x[0] = 10
>>> x[0] == y[0]
True
>>> x[0] == z[0]
False

Note that, np.copy clears previously set WRITEABLE=False flag.

>>> a = np.array([1, 2, 3])
>>> a.flags["WRITEABLE"] = False
>>> b = np.copy(a)
>>> b.flags["WRITEABLE"]
True
>>> b[0] = 3
>>> b
array([3, 2, 3])

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