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simple-reflection.py
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simple-reflection.py
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# [Functions for Reflection]
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# dir() -> show list of attributes
# type()
# getattr()
# callable()
# isinstance()
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class MyClass:
value = 1000
def test():
return "hello"
obj = MyClass()
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# dir()
###--------------------------------------------------------------
print(obj.__dir__()) # -> dir(obj)
# ['__module__', 'value', 'test', '__dict__', '__weakref__',
# '__doc__', '__new__', '__repr__', '__hash__', '__str__',
# '__getattribute__', '__setattr__', '__delattr__', '__lt__',
# '__le__', '__eq__', '__ne__', '__gt__', '__ge__', '__init__',
# '__reduce_ex__', '__reduce__', '__subclasshook__',
# '__init_subclass__', '__format__', '__sizeof__',
# '__dir__', '__class__']
for attr in dir(obj):
x = None
exec(f"x = obj.{attr}")
print(f"obj.{attr}\t\tIs Callable: {callable(x)},\ttype: {type(x)}".expandtabs(20))
"""
obj.__class__ Is Callable: True, type: <class 'type'>
obj.__delattr__ Is Callable: True, type: <class 'method-wrapper'>
obj.__dict__ Is Callable: False, type: <class 'dict'>
obj.__dir__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__doc__ Is Callable: False, type: <class 'NoneType'>
obj.__eq__ Is Callable: True, type: <class 'method-wrapper'>
obj.__format__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__ge__ Is Callable: True, type: <class 'method-wrapper'>
obj.__getattribute__ Is Callable: True, type: <class 'method-wrapper'>
obj.__gt__ Is Callable: True, type: <class 'method-wrapper'>
obj.__hash__ Is Callable: True, type: <class 'method-wrapper'>
obj.__init__ Is Callable: True, type: <class 'method-wrapper'>
obj.__init_subclass__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__le__ Is Callable: True, type: <class 'method-wrapper'>
obj.__lt__ Is Callable: True, type: <class 'method-wrapper'>
obj.__module__ Is Callable: False, type: <class 'str'>
obj.__ne__ Is Callable: True, type: <class 'method-wrapper'>
obj.__new__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__reduce__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__reduce_ex__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__repr__ Is Callable: True, type: <class 'method-wrapper'>
obj.__setattr__ Is Callable: True, type: <class 'method-wrapper'>
obj.__sizeof__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__str__ Is Callable: True, type: <class 'method-wrapper'>
obj.__subclasshook__ Is Callable: True, type: <class 'builtin_function_or_method'>
obj.__weakref__ Is Callable: False, type: <class 'NoneType'>
obj.test Is Callable: True, type: <class 'method'>
obj.value Is Callable: False, type: <class 'int'>
"""
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# type()
###--------------------------------------------------------------
print(f"Check type: ", type(obj))
# Type: <class '__main__.MyClass'>
print(f"Is [obj] type of: {MyClass.__name__} -> ", type(obj) is MyClass)
# Is [obj] type of: MyClass -> True
print(f"Is [obj] type of: {SystemError.__name__} -> ", type(obj) is SystemError)
# Is [obj] type of: SystemError -> False
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# getattr()
###--------------------------------------------------------------
print(obj.__getattribute__("value")) # -> getattr(obj, "value")
# 1000
# AttributeError: 'MyClass' object has no attribute 'value2'
# print(obj.__getattribute__("value2"))
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# callable()
###--------------------------------------------------------------
print(callable(obj)) # False
print(callable(obj.test)) # True
print(callable(obj.value)) # False
# AttributeError: 'MyClass' object has no attribute 'test2'.
# print(callable(obj.test2))
###~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# isinstance()
###--------------------------------------------------------------
print(f"Is [obj] instance of: {MyClass.__name__} -> ", isinstance(obj, MyClass))
# Is [obj] instance of: MyClass -> True
print(f"Is [obj] instance of: {BufferError.__name__} -> ", isinstance(obj, BufferError))
# Is [obj] instance of: BufferError -> False