PyDescript, Python 3

PyDescript

#python 3.6.9
#PyDescript
#MustChar code credit goes to internet sites on python
#rest of the code is created by Rezaul Hoque on January 21,2022;
#contact: jewelmrh@yahoo.com,Dhaka, Bangladesh
#note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;

class MustChar:
    def __set_name__(self, garden, name):
        print(f'__set_name__ was called with garden={garden} and name={name}')
        self.property_name = name

def __get__(self, instance, garden):
        print(f'__get__ was called with instance={instance} and garden={garden}')
        if instance is None:
            return self

return instance.__dict__[self.property_name] or None

def __set__(self, instance, value):
        print(f'__set__ was called with instance={instance} and value={value}')

if not isinstance(value, str):
            raise ValueError(f'The {self.property_name} must a string')

if len(value) == 0:
            raise ValueError(f'The {self.property_name} cannot be empty')

instance.__dict__[self.property_name] = value

class Garden:
    name = MustChar()
    location = MustChar()

@property
    def row(self):
           return self._row
    @row.setter 
    def row(self,val):
           if not isinstance(val,int):
               raise ValueError(f'It must be a number.')
           self._row = val

g = Garden()
print(g.__dict__)
g.name='The Garden'
g.location= 'Backyard'
g.row= 2
print(g.__dict__)


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