Python check variable against multiple lists

Question

So I have 3 lists of data, I need to test if any of the data I get from the json response is in any of the lists, I'm probably being stupid about it but I'm trying to learn and can't seem to get it to work right.

list1 = ['a', 'b', 'c']
list2 = ['a1', 'b1', 'c1']
list2 = ['a2', 'b2', 'c2']

#block of code...
#block of code...

content = json.loads(response.read().decode('utf8'))
data = content
for x in data:
   #if x['name'] in list1: #This works fine the line below does not.
   if x['name'] in (list1, list2, list3):
   print("something")

It could be that it is checking to see if the value x['name'] matches fully and exactly any of the lists in (list1,list2,list3). — Sam CD
– Sam CD, Commented Jul 28, 2015 at 14:58

Bryan Oakley · Accepted Answer · 2015-07-28 14:57:34Z

1

I suggest something simple and straight-forward:

if (x['name'] in list1 or 
    x['name'] in list2 or 
    x['name'] in list3):
    ...

answered Jul 28, 2015 at 14:57

Bryan Oakley

389k53 gold badges582 silver badges739 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Majus457 Over a year ago

While I liked Kasramvd's suggestion, I am choosing this method for simplicity and me making sure I can remember what I'm doing later and not having to scratch my head trying to figure it out again.

Kasravnd · Accepted Answer · 2015-07-28 15:04:01Z

1

As a pythinc way for such tasks you can use any for simulating the OR operand and all for and operand.

So her you can use a generator expression within any() :

if any(x['name'] in i for i in (list1, list2, list3))

answered Jul 28, 2015 at 15:04

Kasravnd

108k19 gold badges167 silver badges195 bronze badges

Comments

Sam CD · Accepted Answer · 2015-07-28 14:59:51Z

0

What about concatenating the lists?

if x['name'] in [list1 + list2 + list3]:

answered Jul 28, 2015 at 14:59

Sam CD

2,1072 gold badges20 silver badges36 bronze badges

1 Comment

jonrsharpe Over a year ago

The downside is that this generates a new list object every time the if statement is reached. If the lists won't change, it is more efficient to move the concatenation outside the for loop.

Collectives™ on Stack Overflow

Python check variable against multiple lists

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related