First, I know how copy and deepcopy from copy module work for a list.
I'm interested the role of __deepcopy special method inside a class.
I need to create custom widgets in Django and I try to understand the
python code behind.
class Widget(metaclass=MediaDefiningClass):
needs_multipart_form = False # Determines does this widget need multipart
form
is_localized = False
is_required = False
supports_microseconds = True # for data and time values
def __init__(self, attrs=None):
if attrs is not None:
self.attrs = attrs.copy()
else:
self.attrs = {}
def __deepcopy__(self, memo):
obj = copy.copy(self)
obj.attrs = self.attrs.copy()
memo[id(self)] = obj
return obj
What is happening with *__deepcopy__* when I make an instance of Widget, or
and instance of a subclass of Widget ? Looks like is making a shallow copy
of attributes and the object itself , but what is the purpose ?
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