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Lists - Python and Q Cheat Sheet (DRAFT) by

Python and Q equivalent of List operations

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

Indexing

Function
Python
Q
by integer
 
l[2]
 
l[2]
first/last
   
first l
last l
from back
 
l[-2]
 
l[count[l] - 2
omiting brackets
   
l 2
by list
 
[l[i] for i in [2, 1]]
 
l[2 1]
multi-­dim­ens­ional
 
l[1][2]
 
l[1][2]
l[1; 2]
eliding index
   
l[; 1]
multi-­dim­ens­ional by list
   
l . 1 2
multi-­dim­ens­ional by list of lists
   
l ./: (1 2; 0 0)
 

Modifi­cation

Function
Python
Q
append single item
 
l.appe­nd(3)
 
l,: 3
append multiple items
 
l.exte­nd([5, 2])
 
l,: 5 2
append dictionary keys
 
l.exte­nd(d)
 
l,: key d
append dictionary values
 
l.exte­nd(­d.v­alu­es())
 
l,: d
insert
 
l.inse­rt(i, 7) 
l: (i#l), 7, i _ l
clear
 
l.clear()
 
l: 0#l
pop
 
l.pop()
 
l: -1 _ l
delete element
 
l.remo­ve(3)
 
l: l except 3
delete multiple element
 
[e for e in l1 if e not in l2]
 
l: l except l2
delete by index
 
del l[3]
 
l: l _ 3