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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

Answer*

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    As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. Commented Mar 21, 2022 at 4:16

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