remove_odd_digits.py

"""
Write a recursive function named `remove_odd_digits` that accepts an
integer parameter n and returns the integer formed by removing the odd digits
from n. For example, the call of `remove_odd_digits(6342118) should return
6248.`
"""

def remove_odd_digits(n: int) -> int:
    if (
        n == 0 or
        (
            n < 10 and
            n % 2 == 1
        )
    ):
        return 0
    elif n % 2 == 0:
        return remove_odd_digits(n // 10) * 10 + n % 10
    elif n % 2 == 1:
        return remove_odd_digits(n // 10)

print(remove_odd_digits(12345))
print(remove_odd_digits(6342118))