How to convert a list and tuple into NumPy arrays?

In this article, let’s discuss how to convert a list and tuple into arrays using NumPy. NumPy provides various methods to do the same using Python.

Example:

Input: [3, 4, 5, 6]
Output: [3 4 5 6]
Explanation: Python list is converted into NumPy Array

Input: ([8, 4, 6], [1, 2, 3])
Output: [[8 4 6] 
                [1 2 3]]
Explanation: Tuple is converted into NumPy Array

Convert a List into NumPy Arrays

These are the methods by which we can convert a list into NumPy Arrays in Python.

• Using numpy.asarray()
• Using numpy.array()

Convert a List into NumPy Arrays using numpy.asarray()

numpy.asarray() method converts the input list into NumPy array. In this example, we are converting Python list into NumPy array by using numpy.asarray().

Python3

import numpy as np

# list
list1 = [3, 4, 5, 6]
print(type(list1))
print(list1)
print()

# conversion
array1 = np.asarray(list1)
print(type(array1))
print(array1)
print()

Output:

<class 'list'> 
[3, 4, 5, 6]
<class 'numpy.ndarray'> 
[3 4 5 6]

Convert a List into NumPy Arrays using numpy.array()

numpy.array() method converts the input list into NumPy array. In this example, we are converting the Python list into NumPy array by using numpy.array().

Python3

import numpy as np


# list
list1 = [1, 2, 3]
print(type(list1))
print(list1)
print()

# conversion
array1 = np.array(list1)
print(type(array1))
print(array1)
print()

Output:

<class 'list'> 
[1, 2, 3]  
<class 'numpy.ndarray'> 
[1 2 3]

Convert a Tuple into NumPy Arrays

These are the methods by which we can convert a tuple into NumPy Arrays.

• Using numpy.asarray()
• Using numpy.array()

Convert a Tuple into NumPy Arrays using numpy.asarray()

numpy.asarray() method converts the input tuple into NumPy array. In this example, we are converting the Python tuple into NumPy array by using numpy.asarray().

Python3

# tuple
tuple1 = ([8, 4, 6], [1, 2, 3])
print(type(tuple1))
print(tuple1)
print()

# conversion
array2 = np.asarray(tuple1)
print(type(array2))
print(array2)

Output:

<class 'tuple'> 
([8, 4, 6], [1, 2, 3])  
<class 'numpy.ndarray'> 
[[8 4 6]  
 [1 2 3]]

Convert a Tuple into NumPy Arrays using numpy.array()

numpy.array() method convert input tuple into NumPy array. In this example, we are converting the Python tuple into NumPy array by using numpy.array().

Python3

# tuple
tuple1 = ([8, 4, 6], [1, 2, 3])
print(type(tuple1))
print(tuple1)
print()

# conversion
array2 = np.array(tuple1)
print(type(array2))
print(array2)

Ouput:

<class 'tuple'> 
([8, 4, 6], [1, 2, 3])  
<class 'numpy.ndarray'> 
[[8 4 6]
 [1 2 3]]