Python:NumPy .fill()

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Anonymous contributor
Published Jul 4, 2024Updated Oct 29, 2025
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The .fill() method is used to fill a NumPy array with a specified scalar value.

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Syntax

ndarray.fill(value)
  • ndarray: The NumPy array to be filled.
  • value: The scalar value to assign to all the elements in the array.

Example

In this example, the .fill() method assigns the scalar value 2798 to all the elements in the one-dimensional NumPy array nf:

# Import NumPy
import numpy as a


# Create a NumPy array
nf = a.arange(12)


# Use the '.fill()' method
nf.fill(2798)


print(nf)

We will get the following result:

[2798 2798 2798 2798 2798 2798 2798 2798 2798 2798 2798 2798]

Codebyte Example

In the following codebyte example, a two-dimensional NumPy array nf is created with specific values and then filled entirely with 985:

Code
Output
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  • Career path
    Computer Science
    Looking for an introduction to the theory behind programming? Master Python while learning data structures, algorithms, and more!
    • Includes 6 Courses
    • With Professional Certification
    • Beginner Friendly.
      75 hours
  • Course
    Learn Python 3
    Learn the basics of Python 3.12, one of the most powerful, versatile, and in-demand programming languages today.

    • With Certificate
    • Beginner Friendly.
      24 hours