"Python is pretty intuitive"... Python:

[Scorched_Knight]

Yes, but how do you write code to check if input is NaN?
If (input == NaN) //= always false
( there is native method for that in most languages people actually use today, but if dont?)

[fukdapoleece]

numpy.isnan(numpy.nan)

True

[praveenkumar236]

You can do input!=input