# 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