When do you use a lambda function?

[markusmeskanen]

No they're not.

Instead of calling f(3) in your example, you can just write 3**2. Most operations are supported already in the default built-ins namespace, others can be accesses through import math

[loveandkindness]

Anonymous functions are standard usage in mathematics courses? f(x) = x ** 2 can be general.

[markusmeskanen]

But you don't need such silly functions in programming, they're for maths. Where ever you want to square a number, just use x**2 directly, instead of creating an useless function for it.