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Lists - Python and Q Cheat Sheet (DRAFT) by

List operations by Ptyhon and Q

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

Modifi­cation

operation
Python
Q
adding item
 
l.appe­nd(3)
 
l,: 3
insert
 
l.inse­rt(i, 7)
 
l: (i#l), 7, i _ l
delete all
 
l.clear()
 
l: 0#l
pop
 
l.pop()
 
l: -1 _ l
remove single
 
l.remo­ve(3)
 
l: l except 3
remove multiple
 
[e for e in l1 if e not in l2]
 
l: l except l2
deleteby index
 
del l[3]
 
l: l _ 3

Simila­rities on general list

operation
Python
Q
length
 
len(l)
 
count t
reverse
 
list(r­eve­rse(l))
 
reverse l
first part
 
l[:2]
 
2#l
last part
 
l[-2:]
 
-2#l
middle part
 
l[1:3]
 
1_3#l
 

operations on list of numbers

operation
Python
Q
minumum
 
min(l)
 
min l
average
 
statis­tic­s.m­ean(l)
 
avg l
variance
 
statis­tic­s.v­ari­ance(l)
 
svar l
cummul­ative sum
 
list(i­ter­too­ls.a­cc­umu­late(l, operat­or.a­dd))
 
sums l
cummul­ative prod
 
list(i­ter­too­ls.a­cc­umu­late(l, operat­or.m­ul))
 
prds l

Split and Join

operation
Python
Q
join
 
"­,".j­oin(l)
 
"­," sv l
split
 
s.spli­t(",­")
 
"­," vs s