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def extend_instance(obj, mixin):
"""Apply mixins to a class instance after creation"""
base_cls = obj.__class__
base_cls_name = obj.__class__.__name__
obj.__class__ = type(
base_cls_name, (mixin, base_cls), {}
) # mixin needs to go first for our forward() logic to work
def getattr_recursive(obj, att):
"""
Return nested attribute of obj
Example: getattr_recursive(obj, 'a.b.c') is equivalent to obj.a.b.c
"""
if att == "":
return obj
i = att.find(".")
if i < 0:
return getattr(obj, att)
else:
return getattr_recursive(getattr(obj, att[:i]), att[i + 1 :])
def setattr_recursive(obj, att, val):
"""
Set nested attribute of obj
Example: setattr_recursive(obj, 'a.b.c', val) is equivalent to obj.a.b.c = val
"""
if "." in att:
obj = getattr_recursive(obj, ".".join(att.split(".")[:-1]))
setattr(obj, att.split(".")[-1], val)
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