Checking input against list elements in Python

Question

I'm trying to make a simple program which first checks to see if a user's input matches a list and then will check what element of the list that input matches and gives a response based on the input. The part I'm having trouble with is, coming up with a way to see what element of the list the input matches, so that I can give a certain response based off of that input. I really would appreciate any help I can get with this problem.

Thanks, Nova

This is my current code that I have so far. Under the first if statement is where I would like to put the check for what element of the list matches the input.

Y = ["How", "Hi", "Hey", "How are you doing", "How's it going", "How", "Hello"]
I = str(input("Start Conversation"))

if I in Y:
    print("Working");

elif I not in Y:
    print("I don't Understand");

If the input matches something from your list, why not simply use the input itself? — Thmei Esi
– Thmei Esi, Commented Dec 8, 2016 at 2:09

Will · Accepted Answer · 2016-12-08 02:09:47Z

3

You can use python's excellent list.index function:

if I in Y:
  print("Working" + str(Y.index(I)));

answered Dec 8, 2016 at 2:09

Will

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1 Comment

nova nanite Over a year ago

Thank you very much this is simple and works perfectly!

Asa Stallard · Accepted Answer · 2016-12-08 05:48:39Z

1

You can throw it in as a one-liner if you want:

Y = ["How", "Hi", "Hey", "How are you doing", "How's it going", "How", "Hello"]
I = str(input("Start Conversation"))

print("Working:", I) if I in Y else print("I don't understand")

As Thmei has already noted, the if matches I against Y, so you already know that the content of I is in the list and it can be printed. If you would prefer to output the actual index of I in Y (if it exists), you can do this:

print(Y.index(I)) if I in Y else print("I don't understand")

Or the long way:

if I in Y:
    print (Y.index(I))
else:
    print ("I don't understand")

answered Dec 8, 2016 at 5:48

Asa Stallard

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Comments

Thmei Esi · Accepted Answer · 2016-12-08 02:15:39Z

0

Since you have already matched I against the items in your list, if I matched one of them, it will be the same as the item it matched.

print(I)

edited Dec 8, 2016 at 2:15

answered Dec 8, 2016 at 2:10

Thmei Esi

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Comments

obwan02 · Accepted Answer · 2016-12-08 02:32:42Z

0

for a in Y:
      if I == a:
            #do something

answered Dec 8, 2016 at 2:32

obwan02

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