The best way to Convert Listing to NumPy Array (With Examples)

You’ll be able to usefulness refer to ordinary syntax to transform an inventory in Python to a NumPy array:

import numpy as np

my_list = [1, 2, 3, 4, 5]

my_array = np.asarray(my_list)

Please see examples displays the best way to usefulness this syntax in observe.

Instance 1: Convert Listing to NumPy Array

Please see code displays the best way to convert an inventory in Python to a NumPy array:

import numpy as np

#develop checklist of values
my_list = [3, 4, 4, 5, 7, 8, 12, 14, 14, 16, 19]

#convert checklist to NumPy array
my_array = np.asarray(my_list)

#view NumPy array
print(my_array)

[ 3  4  4  5  7  8 12 14 14 16 19]

#view object kind
kind(my_array)

numpy.ndarray

Word that you’ll additionally usefulness the dtype argument to specify a undeniable information kind for the untouched NumPy array when acting the conversion:

import numpy as np

#develop checklist of values
my_list = [3, 4, 4, 5, 7, 8, 12, 14, 14, 16, 19]

#convert checklist to NumPy array
my_array = np.asarray(my_list, dtype=np.float64)

#view information form of NumPy array
print(my_array.dtype)

float64

Instance 2: Convert Listing of Lists to NumPy Array of Arrays

Please see code displays the best way to convert an inventory of lists to a NumPy array of arrays:

import numpy as np

#develop checklist of lists
my_list_of_lists = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

#convert checklist to NumPy array
my_array = np.asarray(my_list_of_lists)

#view NumPy array
print(my_array)

[[1 2 3]
 [4 5 6]
 [7 8 9]]

We will nearest usefulness the condition serve as to temporarily get the scale of the untouched array of arrays:

print(my_array.condition)

(3, 3)

This tells us that the NumPy array of arrays has 3 rows and 3 columns.

Backup Sources

Please see tutorials give an explanation for the best way to carry out alternative usual information conversions in Python:

The best way to Convert a Listing to a DataFrame in Python
The best way to Convert a Listing to a DataFrame Row in Python
The best way to Convert Pandas Sequence to DataFrame
The best way to Convert Pandas Sequence to NumPy Array