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Convert List to Numpy Array
To convert a List into Numpy Array in Python, call numpy.array() function and pass the list as argument to this function.
The syntax to call numpy.array() to convert a list into numpy array is
numpy.array(x)
where x is a list.
Return Value
numpy.array() returns a numpy array of type numpy.ndarray.
Examples
1. Convert a list of numbers to a numpy array
In this example, we take a list in x, and convert this list into numpy array using numpy.array().
Python Program
import numpy
x = list([1, 2, 4, 8, 16, 32])
arr = numpy.array(x)
print("List :", x)
print("Numpy Array :", arr)
Run Code CopyOutput
List : [1, 2, 4, 8, 16, 32]
Numpy Array : [ 1 2 4 8 16 32]
2. Convert a list of lists to a numpy array
In this example, we take a list of lists in x, and convert this list into numpy array using numpy.array().
Python Program
import numpy
x = list([[1, 2, 4], [8, 16, 32]])
arr = numpy.array(x)
print("List :", x)
print("Numpy Array :", arr)
Run Code CopyOutput
List : [[1, 2, 4], [8, 16, 32]]
Numpy Array : [[ 1 2 4]
[ 8 16 32]]
Since, there are two levels of lists, we get a two-dimensional numpy array.
Summary
In this Numpy Tutorial, we learned how to convert a list into a numpy array, with the help of syntax and examples.