[Tutor] Concept related to python classes

[Manprit Singh]

Dear Sir,

Now i am writing a thankyou email for all of you :
Specially to Alan sir , he expressed his straightforward  disagreement with
my ideas , when i was wrong .
Secondarily to  Mats Wichmann & boB Stepp & Richard Damon, the discussion
between them helped me to learn something.


I am basically an Electronics Engineer with approx 10 years experience in
the electronics industry and with no computer programming background , and
have started learning Python some 4 to  5 months back.  Upon finding a
word @property in one of the recent mails, I started reading about property
and then implemented it  with a little understanding and luckily wrote a
program for the first time with a quite lengthy and inefficient code , but
glad that you all mademe to learn about @property.

At last now I have written a code with the help of all of you that seems to
be quiet short and easy., and is quite convincing to me .Code is given
below:

class Triangle:
    def __init__(self,  x, y, z):
        self.resize(x, y, z)

    @property
    def area(self):
        s = (self.a + self.b + self.c) / 2
        return (s * (s - self.a) * (s - self.b) * (s - self.c))**0.5

    def resize(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c

tri = Triangle(3, 4, 5)
print(tri.area)
tri.resize(4, 4, 5)
print(tri.area)

The output is:

6.0
7.806247497997997

Regards
Manprit Singh