# Create 3D Array in NumPy

Contents

## NumPy – Create 3D Array

To create a 3D (3 dimensional) array in Python using NumPy library, we can use any of the following methods.

• numpy.array() – Creates array from given values.
• numpy.zeros() – Creates array of zeros.
• numpy.ones() – Creates array of ones.
• numpy.empty() – Creates an empty array.

### 1. Create 3D Array using numpy.array()

Pass a nested list (list of lists of lists) to numpy.array() function.

In the following program, we create a numpy 3D array of shape (2, 3, 4).

Python Program

``````import numpy as np

# create a 3D array with shape (2, 3, 4)
nested_list = [[[1, 2, 3, 4], [5, 6, 7, 8], [9, 10, 11, 12]],
[[13, 14, 15, 16], [17, 18, 19, 20], [21, 22, 23, 24]]]
arr = np.array(nested_list)

print(arr)``````
Run Code Copy

Output

``````[[[ 1  2  3  4]
[ 5  6  7  8]
[ 9 10 11 12]]

[[13 14 15 16]
[17 18 19 20]
[21 22 23 24]]]``````

### 2. Create 3D Array using numpy.zeros()

Pass shape of the required 2D array, as a tuple, as argument to numpy.zeros() function. The function returns a numpy array with specified shape, and all elements in the array initialised to zeros.

Python Program

``````import numpy as np

# create a 3D array with shape (2, 3, 4)
shape = (2, 3, 4)
arr = np.zeros(shape)

print(arr)``````
Run Code Copy

Output

``````[[[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]]

[[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]]]``````

### 3. Create 3D Array using numpy.ones()

Pass shape of the required 3D array, as a tuple, as argument to numpy.ones() function. The function returns a numpy array with specified shape, and all elements in the array initialised to ones.

Python Program

``````import numpy as np

# create a 3D array with shape (2, 3, 4)
shape = (2, 3, 4)
arr = np.ones(shape)

print(arr)``````
Run Code Copy

Output

``````[[[1. 1. 1. 1.]
[1. 1. 1. 1.]
[1. 1. 1. 1.]]

[[1. 1. 1. 1.]
[1. 1. 1. 1.]
[1. 1. 1. 1.]]]``````

### 4. Create 3D Array using numpy.empty()

Pass shape of the required 3D array, as a tuple, as argument to numpy.empty() function. The function returns a numpy array with specified shape.

Python Program

``````import numpy as np

# create a 3D array with shape (2, 3, 4)
shape = (2, 3, 4)
arr = np.empty(shape)

print(arr)``````
Run Code Copy

Output

``````[[[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]]

[[0. 0. 0. 0.]
[0. 0. 0. 0.]
[0. 0. 0. 0.]]]``````

## Summary

In this NumPy Tutorial, we learned how to create a 3D numpy array in Python using different NumPy functions.

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