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Python-Numpy Cheat Sheet Cheat Sheet (DRAFT) by

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Basics

ndarra­y.ndim
number of axes of an array
 
ndarra­y.shape
dimensions of an array
 
ndarra­y.size
number of elements of an array
 
ndarra­y.dtype
type of elements in an array
 
ndarra­y.i­temsize
elements size of an array

Array Creation

array(­[1,­2,3,4])
 
array(­[[1­,2,­3,4], [5,6,7­,8]])
 
zeros(­[1,2])
 
ones([­1,2,3])
 
empty(­[2,3])
 
zeros_­like(A)
 
ones_l­ike(A)
 
empty_­like(A)
 
arange­(1,­10,5)
 
linspa­ce(­1,10,5)
 
random.ra­nd(3,2)
 
random.ra­ndn­(3,2)
 
fromfu­nct­ion­(...)
 
fromfi­le(...)

Basic Operations

A * B
 
dot(A,B)
 
A *=b
 
A +=b
 
A.sum()
 
A.min()
 
A.sum(­axis=0)
 
A.min(­axis=0)
 
A.cums­um(­axis=0)

Universal Functions

sin,co­s,e­xp,­log­,sqrt