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Using Nested Conditional Expressions

I have an exercise from a book with this code snippet:

def binomial_coeff(n, k):
 """Compute the binomial coefficient "n choose k".
 n: number of trials
 k: number of successes
 returns: int
 """
 if k == 0:
 return 1
 if n == 0:
 return 0
 res = binomial_coeff(n-1, k) + binomial_coeff(n-1, k-1)
 return res

the goal of the exercise is to rewrite the if statements as nested conditional expressions. I understand how to write a conditional expression e.g.

return 1 if k == 0

What am I missing here? By doing this nested, I can't seem to figure it out. PyCharm keeps complaining about that it the second part of the code is unreachable.

return 1 if k == 0 else return 0 if n == 0

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    Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center. Commented Nov 4, 2021 at 8:58
  • 1
    Please don't post only code as an answer, but also provide an explanation what your code does and how it solves the problem of the question. Answers with an explanation are usually more helpful and of better quality, and are more likely to attract upvotes. Commented Nov 4, 2021 at 16:49

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