On 12/06/20 8:51 AM, zljubi...@gmail.com wrote:
Hi,
If I run this code:
class Property:
def __init__(self, var: int):
self.a: int = var
@property
def a(self):
return self.__a
@a.setter
def a(self, var: int):
if var > 0 and var % 2 == 0:
self.__a = var
else:
self.__a = 2
if __name__ == '__main__':
x = Property(1.5)
print(x.a)
I am getting 2.
How come, if I have created a class with :int in order to ensure that "a"
property must be an integer, that I can create an instance with float (1.5)?
You may be confusing Python with some other programming language
previously-learned. We need to 're-wire' the way your mind is working
because whilst you are not-wrong for that-language, you are not-right
for Python.
So, I'm not going to answer your question directly, but to offer you a
learning-path:-
What did mypy (or...) say, when you ran tests against the source-code?
(Typing is no use without such a testing regime!)
Have you read the docs for Typing?
- and for extra bonus-points, the numerous PEPs (proposals and accepted)
related to how Python implements Typing?
(that done, you will likely answer your own question, and accumulate
some useful learning about Python - at both the practical and
philosophical/idiomatic levels)
--
Regards =dn
--
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