# typedproperty.py

def typedproperty(name, expected_type):

private_name = '_' + name

@property

def prop(self):

return getattr(self, private_name)

@prop.setter

def prop(self, value):

if not isinstance(value, expected_type):

raise TypeError(f'Expected {expected_type}')

setattr(self, private_name, value)

return prop

String = lambda name: typedproperty(name, str)

Integer = lambda name: typedproperty(name, int)

Float = lambda name: typedproperty(name, float)

# Example

if __name__ == '__main__':

class Stock:

name = typedproperty('name', str)

shares = typedproperty('shares', int)

price = typedproperty('price', float)

def __init__(self, name, shares, price):

self.name = name

self.shares = shares

self.price = price

class Stock2:

name = String('name')

shares = Integer('shares')

price = Float('price')

def __init__(self, name, shares, price):

self.name = name

self.shares = shares

self.price = price