How to Import NumPy: Simple Syntax and Examples

To import the NumPy library in Python, use the code import numpy as np. This imports NumPy and gives it the short name np for easy use in your code.

Syntax

The basic syntax to import NumPy is import numpy. To make it easier to use, it is common to give it a short name like np using import numpy as np. This means you can use np instead of typing numpy every time.

python

import numpy as np

Example

This example shows how to import NumPy and create a simple array. It demonstrates using the short name np to call NumPy functions.

python

import numpy as np

arr = np.array([1, 2, 3])
print(arr)

Output

[1 2 3]

Common Pitfalls

One common mistake is forgetting to install NumPy before importing it, which causes an error. Another is importing without the alias and then trying to use np, which will cause a NameError.

Wrong way:

import numpy
print(np.array([1, 2, 3]))  # Error: np is not defined

Right way:

import numpy as np
print(np.array([1, 2, 3]))

Quick Reference

Here is a quick summary of how to import NumPy:

Import Statement	Description
import numpy	Imports NumPy without alias; use full name 'numpy'
import numpy as np	Imports NumPy with alias 'np' for shorter code
from numpy import array	Imports only the 'array' function from NumPy

Key Takeaways

Use import numpy as np to import NumPy with a short alias.

Always install NumPy before importing it to avoid errors.

Using the alias np makes your code cleaner and easier to read.

Avoid using np without importing NumPy as np first.

You can import specific functions from NumPy if you only need a few.