Python IF multiple "and" "or" in one statement

Question

I am just wondering if this following if statement works:

    value=[1,2,3,4,5,f]
    target = [1,2,3,4,5,6,f]
    if value[0] in target OR value[1] in target AND value[6] in target:
       print ("good")

My goal is to make sure the following 2 requirements are all met at the same time: 1. value[6] must be in target 2. either value[0] or value[1] in target Apologize if I made a bad example but my question is that if I could make three AND & OR in one statement? Many thanks!

You will index error when you will try to access value[6] and apart of that, what is f in value list, is that some variable or element of list, if this is the element of list, then you should enclose it under single or double quote. — Pramod
– Pramod, Commented Mar 30, 2016 at 1:54
What course materials are you using that instruct you to use AND and OR in uppercase? — TigerhawkT3
– TigerhawkT3, Commented Mar 30, 2016 at 1:57
@TigerhawkT3 actually i put them in uppercase cuz it helps ppl quickly understand what my question is. nothing to do with ANY course materials — yingnan liu
– yingnan liu, Commented Mar 30, 2016 at 2:10

alecxe · Accepted Answer · 2016-03-30 01:57:47Z

17

Use parenthesis to group the conditions:

if value[6] in target and (value[0] in target or value[1] in target):

Note that you can make the in lookups in constant time if you would define the target as a set:

target = {1,2,3,4,5,6,f}

And, as mentioned by @Pramod in comments, in this case value[6] would result in an IndexError since there are only 6 elements defined in value and indexing is 0-based.

edited Mar 30, 2016 at 1:57

answered Mar 30, 2016 at 1:52

alecxe

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Comments

Javi · Accepted Answer · 2021-02-09 09:20:34Z

0

If I am not wrong and has priority, so doing:

if x==True or y==True and z==True:
    do smth

would be like doing:

if x==True or (y==True and z==True):

not like doing:

(if x==True or y==True) and z==True:

But as @alecxe commented, it is always safer to use () when more than 2 logic arguments are used.

answered Feb 9, 2021 at 9:20

Javi

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