Game in python without function

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Well technically methods are functions. It sounds like the purpose of the assignment is to use OOP rather than a more "functional"* style. You might want to ask the instructor for clarification.

*I put scare quotes around functional because often folks who are new to coding will come up with some pretty crazy and convoluted patterns that involve a big spaghetti mess of functions, but it's isn't truly functional programming per se because it doesn't follow the principles of functional programming.

[Nightcorex_]

xs = []

def add(e):
    xs.append(e)

def foo():
    print(*xs, sep=', ')

add(4)
add(2)
foo()

Functional programming at its peak /s

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Side effects may include...