NumPy

Resources

• Homepage
• Quickstart
• Unofficial
  • Numpy cheatsheet by Datacamp. From blog post.
  • Numpy cheat sheet on DataQuest.

Installation

From Install page.

Using Conda.

$ conda install numpy

Using Pip.

$ pip install numpy

Basics

import numpy as np


a = np.arange(15).reshape(3, 5)

a
# array([[ 0,  1,  2,  3,  4],
#        [ 5,  6,  7,  8,  9],
#       [10, 11, 12, 13, 14]])

a.shape
# (3, 5)

a.ndim
# 2

a.dtype.name
# 'int64'

a.itemsize
# 8

a.size
# 15

type(a)
# <class 'numpy.ndarray'>

b = np.array([6, 7, 8])

b
# array([6, 7, 8])

type(b)
# <class 'numpy.ndarray'>