101 lines
3.4 KiB
Python
101 lines
3.4 KiB
Python
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# https://stepik.org/lesson/701985/step/10?unit=702086
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class ValidateString:
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def __init__(self, min_length=0, max_length=1000):
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self.min_length, self.max_length = min_length, max_length
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def validate(self, value):
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return (
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isinstance(value, str) and self.min_length <= len(value) <= self.max_length
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)
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class StringValue:
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def __init__(self, validator=None):
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if validator is None:
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validator = ValidateString(min_length=3, max_length=100)
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self.validator = validator
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def __set_name__(self, owner, name):
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self.name = "_" + name
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def __get__(self, instance, owner):
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return getattr(instance, self.name)
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def __set__(self, instance, value):
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if self.validator.validate(value):
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setattr(instance, self.name, value)
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class RegisterForm:
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login = StringValue()
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password = StringValue(ValidateString(min_length=3, max_length=100))
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email = StringValue()
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def __init__(self, login, password, email):
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self.login, self.password, self.email = login, password, email
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def get_fields(self):
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return [self.login, self.password, self.email]
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def show(self):
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print(f"<form>")
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for name, field in zip("Логин Пароль Email".split(), self.get_fields()):
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print(f"{name}: {field}")
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print(f"</form>")
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def tests():
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assert hasattr(
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ValidateString, "validate"
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), "в классе ValidateString отсутствует метод validate"
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r = RegisterForm("11111", "1111111", "11111111")
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assert (
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hasattr(r, "login") and hasattr(r, "password") and hasattr(r, "email")
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), "в классе RegisterForm должны быть дескрипторы login, password, email"
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assert hasattr(RegisterForm, "show"), "в классе RegisterForm отсутствует метод show"
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StringValue.__doc__
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frm = RegisterForm("123", "2345", "sc_lib@list.ru")
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assert frm.get_fields() == [
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"123",
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"2345",
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"sc_lib@list.ru",
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], "метод get_fields вернул неверные данные"
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frm.login = "root"
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assert frm.login == "root", "дескриптор login вернул неверные данные"
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v = ValidateString(5, 10)
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assert v.validate("hello"), "метод validate вернул неверное значение"
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assert v.validate("hell") == False, "метод validate вернул неверное значение"
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assert (
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v.validate("hello world!") == False
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), "метод validate вернул неверное значение"
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class A:
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st = StringValue(validator=ValidateString(3, 10))
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a = A()
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a.st = "hello"
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assert a.st == "hello", "дескриптор StringValue вернул неверное значение"
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a.st = "d"
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assert (
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a.st == "hello"
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), "дескриптор StringValue сохранил строку длиной меньше min_length"
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a.st = "dапарпаропропропропр"
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assert (
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a.st == "hello"
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), "дескриптор StringValue сохранил строку длиной больше max_length"
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a.st = "dапарпароп"
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assert (
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a.st == "dапарпароп"
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), "дескриптор StringValue сохранил строку длиной больше max_length"
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tests()
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