Functions - General Questions

Which parameter kind must be passed by keyword in def f(a, *, b):?

What is the output of the following code?

def f(x, lst=[]):
    lst.append(x)
    return lst
f(1)
print(f(2))

What is the output of the following code?

def info(**kw):
    return sorted(kw)
print(info(b=1, a=2))

What is the output of the following code?

def fact(n):
    return 1 if n <= 1 else n * fact(n - 1)
print(fact(6))

What is the output of the following code?

def f(n):
    return n * 2, n * 3
a, b = f(4)
print(a, b)