Val keyword in Python (Kotlin)

The Val keyword is used to declare a new variable with kotlin not in Python. It is like ‘var‘, however in this case the variable cannot be reused.

Val is immutable. Once assigned the Val becomes read-only, however, the properties of a val object could be changed, but the object itself is read-only.

Note: there is no in built equivalent fucntion for Val() in Python

Val keyword in Python

Simple example code.

fun main()
{
    val marks = 10 
    println("Previous marks is " + marks)
    marks = 30 
    println("new marks " + marks)
}

Output: Val cannot be reassigned

// Changing values of val object
fun main()
{
    val book = Book("Java", 1000)
    println(book)
    book.name = "Kotlin" 
    println(book)
}
data class Book(var name : String = "",
                var price : Int = 0)

Output:

Book(name=Java, price=1000)
Book(name=Kotlin, price=1000)

Do comment if you have any doubts or suggestions on this Python keywords topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.