append a value to a numpy array in python

To append a value to a NumPy array in Python, we can use the numpy.append() method.

Here is an example of how to use this method:

main.py
import numpy as np

# create an empty numpy array
my_array = np.array([])

# append a value to the numpy array
my_array = np.append(my_array, 1)

# print the array to verify that the value was appended
print(my_array)

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This will output:

main.py
[1.]

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2 lines

Note that numpy.append() returns a new array with the appended values and the original array is not modified. Therefore, we need to assign the returned value to a variable to keep the appended value.

We can also append multiple values at once by passing a sequence of values to numpy.append(), for example:

main.py
import numpy as np

# create an empty numpy array
my_array = np.array([])

# append multiple values to the numpy array
my_array = np.append(my_array, [1, 2, 3])

# print the array to verify that the values were appended
print(my_array)

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This will output:

main.py
[1. 2. 3.]

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2 lines

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related categories

python
numpy
arrays

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