input validation class with a flexible 'add_rules(condition, msg)`

InputValidator.py

class InputValidator:
    def __init__(self, prompt, cast=str, error_msg="Invalid input."):
        self.prompt = prompt
        self.cast = cast
        self.error_msg = error_msg
        self.rules = []

    def add_rule(self, condition, message=None):
        self.rules.append((condition, message or self.error_msg))
        return self  # allows method chaining

    def get(self):
        while True:
            try:
                value = self.cast(input(self.prompt))
                failed = [msg for check, msg in self.rules if not check(value)]
                if not failed:
                    return value
                for msg in failed:
                    print(msg)
            except (ValueError, TypeError):
                print(self.error_msg)


                
# examples:
score = (
    InputValidator("Enter score: ", cast=int, error_msg="Must be a number.")
    .add_rule(lambda userinput: userinput >= 0, "Score cannot be negative.")
    .add_rule(lambda userinput: userinput <= 100, "Score cannot exceed 100.")
    .get()
)

# of course, 'userinput' can be replaced with 'x' as standard:
# `.add_rule(lambda x: "@" in x, "Email must contain @.")`
email = (
    InputValidator("Enter email: ", cast=str, error_msg="Invalid input.")
    .add_rule(lambda userinput: "@" in userinput,                 "Email must contain @.")
    .add_rule(lambda userinput: "." in userinput.split("@")[-1],  "Email must have a valid domain.")
    .add_rule(lambda userinput: len(userinput) >= 5,              "Email is too short.")
    .get()
)

# of course, 'userinput' can be replaced with 'x' as standard:
#   `.add_rule(lambda x: len(x) >= 8, "Password must be at least 8 characters.")`
# or 'character' can be replaced with 'c':
#   `.add_rule(lambda x: any(c.isupper() for c in x), "Must contain an uppercase letter.")`
password = (
    InputValidator("Enter password: ", cast=str, error_msg="Invalid input.")
    .add_rule(lambda userinput: len(userinput) >= 8, "Password must be at least 8 characters.")
    .add_rule(lambda userinput: any(character.isupper() for character in userinput), "Must contain an uppercase letter.")
    .add_rule(lambda userinput: any(character.islower() for character in userinput), "Must contain a lowercase letter.")
    .add_rule(lambda userinput: any(character.isdigit() for character in userinput), "Must contain a number.")
    .add_rule(lambda userinput: any(character in "!@#$%^&*()-_=+" for character in userinput), "Must contain a special character.")
    .get()
)

# to save time, this would do the same thing:
password = (
    InputValidator("Enter password: ", cast=str, error_msg="Invalid input.")
    .add_rule(lambda x: len(x) >= 8, "Password must be at least 8 characters.")
    .add_rule(lambda x: any(c.isupper() for c in x), "Must contain an uppercase letter.")
    .add_rule(lambda x: any(c.islower() for c in x), "Must contain a lowercase letter.")
    .add_rule(lambda x: any(c.isdigit() for c in x), "Must contain a number.")
    .add_rule(lambda x: any(c in "!@#$%^&*()-_=+" for c in x), "Must contain a special character.")
    .get()
)