This is my custom decorator class. When I decorate them for functions and classes, auxiliary info is printed if these items are used.
# decorator.py
class BaseDecorator(object):
"""
Base decorator class
"""
def __init__(self, message, source=''):
self.message = message
self.source = source
def __call__(self, func):
print(f"{type(func).__name__.capitalize()} `{func.__name__}` {self.message}")
if self.source:
print(f"Source: {self.source}")
def wrapper(*args, **kwargs):
return func(*args, **kwargs)
return wrapper
class Important(BaseDecorator):
"""
The decorated content is of great importance!
"""
def __init__(self, reason: str = '** No reason given. **'):
super().__init__("is important: " + reason)
class Copied(BaseDecorator):
"""
The decorated content is copied from somewhere.
"""
def __init__(self, source=''):
super().__init__("is copied.", source)
And when I use them like this:
from decorators_module import Important, Copied # Assuming these decorators are defined in another module
class Solution:
@Important(reason="This function does something crucial.")
def critical_task(self):
...
@Copied(source="Inspired by StackOverflow")
def helper_function(self):
...
if __name__ == '__main__':
solution = Solution()
solution.critical_task() # Only this function is called
Both the information in Copied and Important is printed. As I expected, only information in Important should be printed.
These are the actual outputs:
Function `critical_task` is important: This function does something crucial.
Function `helper_function` is copied.
Source: Inspired by StackOverflow
Can anyone help me to figure out the problem? Great appreciation in advance!
>Solution :
Your print staments are in the wrong place. Move then thus:
# decorator.py
class BaseDecorator(object):
"""
Base decorator class
"""
def __init__(self, message, source=''):
self.message = message
self.source = source
def __call__(self, func):
def wrapper(*args, **kwargs):
print(f"{type(func).__name__.capitalize()} `{func.__name__}` {self.message}")
if self.source:
print(f"Source: {self.source}")
return func(*args, **kwargs)
return wrapper