Created
February 16, 2022 14:30
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Attribute Descriptors
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| import logging | |
| logging.basicConfig(level=logging.INFO) | |
| class LoggingProperty: | |
| def __init__(self): | |
| logging.info(f"Initializing '{self.__class__.__name__}'") | |
| def __set_name__(self, owner, name): | |
| logging.info(f"Setting '{self.__class__.__name__}.property_name' to '{name}'") | |
| self.property_name = name | |
| def __get__(self, instance, owner=None): | |
| logging.info(f"Getting '{instance.__class__.__name__}.{self.property_name}'") | |
| return instance.__dict__[self.property_name] | |
| def __set__(self, instance, value): | |
| logging.info( | |
| f"Setting '{instance.__class__.__name__}.{self.property_name}' to '{value}'" | |
| ) | |
| instance.__dict__[self.property_name] = value | |
| class Person: | |
| first_name = LoggingProperty() | |
| def __init__(self, first_name): | |
| cls_name = type(self).__name__ | |
| logging.info(f"Initializing '{self.__class__.__name__}'") | |
| self.first_name = first_name | |
| person = Person("John") | |
| person.first_name | |
| # INFO:root:Initializing 'LoggingProperty' | |
| # INFO:root:Setting 'LoggingProperty.property_name' to 'first_name' | |
| # INFO:root:Initializing 'Person' | |
| # INFO:root:Setting 'Person.first_name' to 'John' | |
| # INFO:root:Getting 'Person.first_name' |
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