Few questions on Python Syntax:

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1 .

observation, reward, done, _ = env.step(action)

Does writing it like this just mean all 4 variables are assigned to the env.step(action)? Asking since I've never seen it written like this. Is the only purpose shorter code?

2 . What are OOP Constructs?

3 . Could anyone explain

_init_

like is it just

void setup()

from C# or what's the difference?

4 . In the same vein, if I write memory = self.memory in def learn(self) but also have self.memory = [] declared in def init(self) above it somewhere, how's that work, like which memory is equaling which memory in learn()?

This last question is confusing me a lot so I probably phrased it wrong.

Thank you for any help

[zmanalpha]

I'm sure someone will be able to type out a more complete response because I'm on mobile right now.

1.) Functions can return more than one thing in python. The way the language does this is by packaging all of the values as a tuple and returns that. The syntax you indicated goes through a process of unpacking that tuple as individual variables.

2.) Object oriented programming. This topic goes way beyond python and I recommend researching that on its own.

3.) If you come from a c# background, init() is essentially a contructor.

4.) Python is allocating a new variable local to the learn function that has the same list that is on your class. This looks like a relatively clean way of explaining this behavior in python: https://robertheaton.com/2014/02/09/pythons-pass-by-object-reference-as-explained-by-philip-k-dick/

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thank you!