NumPy Getting Started

Installing NumPy with pip

NumPy is not part of the Python standard library, so it must be installed separately. The simplest way is with pip, Python's package installer, which downloads NumPy from the Python Package Index (PyPI) and installs it into your current Python environment.

pip install numpy

Importing NumPy

Once installed, bring NumPy into a script with a single import statement. By convention, almost every developer imports it under the short alias np, which keeps code readable and matches the official documentation and most tutorials.

import numpy as np

print(np.__version__)

Trying Out Your Installation

A quick way to confirm everything works end-to-end is to build a small array, inspect it, and run some math on it.

import numpy as np

arr = np.array([1, 2, 3, 4, 5])
print(arr)          # [1 2 3 4 5]
print(arr.shape)    # (5,)

doubled = arr + arr
print(doubled)      # [ 2  4  6  8 10]

import numpy as np

values = np.array([4, 9, 16, 25])

print(np.sqrt(values))   # [2. 3. 4. 5.]
print(np.mean(values))   # 13.5