nums=[1,"2","3","4"] print (4 not in nums)

Question

How this could print true? anybody explain ?

Answer 1

4 and "4" are different

Answer 2

Coding Kitty, because the "not" operator is used.
4, how is the integer value not in the "nums" array? Well no.

Answer 3

wait. ooh. I forgot. he used not

Answer 4

Because 4 is an integer. Integers and strings are different data types. Integers are whole numbers and inputted like this in many programming languages:

4, 999 , 1000000

to input an integer in Python, use: int(input())
Example:

integer = int(input())

Strings are any characters (including numbers and integers) and usually inputted with single (') or double (") quotation marks. Examples are:
"4", "1.007", "string"
Example inputting in Python:
string = ["str", "ing"]
string = str(input()), input: string, result: 'string'

Let me give you some examples on how different strings and integers:

4==4
Outputs True since they are equal and both an integer
5=="5"
Outputs False since the first 5 is an integer and the second 5 is an string (inputted with quotation marks)
"5"=='5'
Outputs True since they are both strings (double vs single quotation marks, but still both quotation marks)

Answer 5

It's output could be True because of using 'not', it alter the bool value

Answer 6

@Frogged
but it should print false though. he says it printed true even though there's no integer 4 in that list?

Answer 7

And because you use not in a different data (4 vs "4"). I've explained their difference recently.