How to extract one item's index in python from a list?

Question

I want to extract an index of just one item from the list

def main():
mylist = [21, 5, 8, 52, 21, 87]
num = input("What number: ")
if num in mylist:
    print(mylist.index(int(num)))

I tried this but it doesn't output like it should, it prints nothing.

num (the string) won't be in the list, you know this because you convert it to an integer before trying to get its index — Sayse, Mar 02 '20 at 15:43
`input` gives you strings; you need to convert them to ints first — Jussi Nurminen, Mar 02 '20 at 15:43
What do you mean it prints nothing? This should raise an exception... And it will make it easier if you cast to int from the start: `num = int(input(...))` — Tomerikoo, Mar 02 '20 at 15:48
_I tried this but it doesn't output like it should, it prints nothing._ ..... _it says Process finished with exit code 0_ How is that possible? **That code leads to an exception.** — AMC, Mar 02 '20 at 17:21
Does this answer your question? [How can I read inputs as numbers?](https://stackoverflow.com/questions/20449427/how-can-i-read-inputs-as-numbers) — AMC, Mar 02 '20 at 17:21

score 0 · Accepted Answer · answered Mar 02 '20 at 15:47

0

You forgot to parse the input

if int(num) in mylist:

Now it'll work :)

answered Mar 02 '20 at 15:47

1 Answers1