NumPy.copy(): How to Copy NumPy Arrays

Python (1)

Today we are going to learn how to copy a NumPy array. We will try in our code snippet with different methods as well. Hope You guys will practice with us to get your result as expected. Let’s get into it.

What is a NumPy Array?

An array is a collection of data of similar datatypes stored at contiguous memory locations. It is the simplest data structure where each data element can be accessed directly by only using its index number. In Python, an array is a type of data structure of the NumPy library. Some key features of a NumPy array are given as follows.

  • It is homogeneous in nature. We can perform all the operations on the array elements. 
  • The Arrays in NumPy can be one-dimensional or multidimensional.
  • It contains tools for code integration.
  • We can create arrays of different data types.
  • All the elements of the NumPy Array have equal sizes in the memory block.

Let’s understand how to create a NumPy Array. We can follow the following code snippet to create our first NumPy array using the Python IDLE shell. Let’s code with you.

#importing the numpy module
import numpy as np

#creating array
my_array = np.array(["Hi", "Hello", "Welcome", "to", "JournalDev"])

#printing our array


The above code snippet will give output as follows, where we can see that an array was created and one more thing we had printed is the type of the Array, it is numpy.ndarray.

["Hi", "Hello", "Welcome", "to", "JournalDev"]
<class 'numpy.ndarray'>

Before following our code snippet, make sure You have installed the NumPy module on your computer, if not You can download this module by using the pip package installer in the command prompt as follows.

pip install numpy

Now, We will understand different ways to copy our NumPy Array using different methods as follows.

1. Using NumPy.copy() Method

numpy.copy() method creates a copy of our Array. In the below example, We are going to copy the Array‘array‘ to another Array‘copy_array‘ using this method.

#importing the numpy module
import numpy as np
# Creating a numpy Arrayusing numpy.array()
array = np.array([10.7, 16.94, 18.21, 25.50, 25.3, 56.9, 52.1])

#printing our original Array
# Using numpy.copy() function
new_array= np.copy(array)

#printing the copied Arrayas new_array

The above code snippet will copy the contents of the Array to the new_array using the .copy() method and will give the output as follows.

Copied Array
Copied Array

The syntax for the above method is :

numpy.copy(array, order='K')

The parameters on the above code snippet are :

  • array – the name of the array to be copied
  • order – Controls the memory layout of the copy. by default order=’K’. It’s optional.

2. Copying Multi-Dimensional Numpy Arrays

Let’s see another example of the .copy() method to copy multi-dimensional NumPy Arrays. Follow the below code snippet.

import numpy as np

# Creating a multi dimensional Array
array = np.array([['a','b','c'], ['h','d','s']])

#printing the original Array
# using numpy.copy() method to copy
new_array = np.copy(array)

#printing the copied Array

The above code snippet will copy the multidimensional Array to the new Array and will give the output as follows.

Copy Multidimensional Array 1
Copy Multidimensional Array 1

3. Copying Numpy Arrays Using the Assignment Operator

import numpy as np
# creating a 2 Dimensional array
array = np.array([['a','b','c'], ['h','d','s']])

# using Assignment operator
new_array= array

# printing copied array

in the above code snippet, The contents of the Array were assigned to new_array by the assignment operator=“. Let’s see the output for the same.

Assignment Operator Example Output
Assignment Operator Example Output

4. Using NumPy.empty_like() Method

import numpy as np
# creating an Array
array = np.array(["hello", "how", "are", "You"])

# Creating an empty Numpy array similar to Array
new_array = np.empty_like(array)

# Now assign Array to copy
new_array [:] = array

#printing our new Array
print(new_array )

This method returns arbitrary data with the same data. it doesn’t initialize the value. Since it doesn’t initialize, we need to assign the values to it. In this way, we copied our array to new_array. The output of the above code snippet is given as follows.

Empty Like Method Example Output
Empty Like Method Example Output


In this article, I have learned how to create a copy of the NumPy Array using for different methods with examples. Hope You must have practiced and enjoyed our code snippets. We must visit again with some more exciting topics.