def typed_property(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

Integer = lambda name: typed_property(name, int)

Float = lambda name: typed_property(name, float)

class Holdings:

shares = Integer('shares')

prices = Float('prices')

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

self.name = name

self.shares = shares

self.prices = prices

if __name__ == '__main__':

h = Holdings('IBM', 25, 4.1)

print(f'{h.name} cost : {h.shares * h.prices}')

# h.shares = '10' # TypeError: Expected <class 'int'>