+ slice
[start:end]
<inclusive:exclusive>
del() : remove item from the list.
x = ['a', 'b', 'c'] del(x[1]) # ['a', 'c']
=
copy by reference
list() , [:]
copy by value
import numpy;
import numpy as np; # recommended, it's clearly define what array belong to np
from numpy import array;
np array ស្រដៀងនឹង python list ដែរ
np array ធ្វើការលើធាតុមួយៗរបស់ array,
only contains single type
np[rows, columns]
np[:,1:3]
=> select both :height
and :weight
but only 2nd and 3rd members
help() : man
np.random.normal(a, b, c) : េលខ a, គំលាត b, ចំនួន c
np.column_stack