プログラムでのユーザー入力が有効であることを確認するにはどうすればよいですか?

while True:
    try:
        age = int(input("Please enter your age: "))
    except ValueError:
        print("Sorry, I didn't understand that.")
        continue
    else:
        break

while True:
    data = input("Pick an answer from A to D:")
    if data.lower() not in ('a', 'b', 'c', 'd'):
        print("Not an appropriate choice.")
    else:
        break

while True:
    try:
        age = int(input("Please enter your age: "))
    except ValueError:
        print("Sorry, I didn't understand that.")
        continue

    if age < 0:
        print("Sorry, your response must not be negative.")
        continue
    else:
        break

def get_non_negative_int(prompt):
    while True:
        value = int(input(prompt))
        if value >= 0:
            break
    return value

age = get_non_negative_int("Please enter your age: ")

def sanitised_input(prompt, type_=None, min_=None, max_=None, range_=None):
    while True:
        ui = input(prompt)
        try:
            if type_ is not None:
                ui = type_(ui)
        except ValueError:
            continue

        # Perform further validation checks and return valid input if all criteria are met.