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Python setattr vs __setattr__ UnicodeEncodeError

I know that we have to use setattr method when we are outside of an object. However, I have troubles calling setattr with unicode key leading me to use __setattr__ directly.

class MyObject(object):
 def __init__(self):
 self.__dict__["properties"] = dict()
 def __setattr__(self, k, v):
 self.properties[k] = v
obj = MyObject()

And I get the following content of obj.properties:

  • setattr(obj, u"é", u"à"): raise UnicodeEncodeError
  • setattr(obj, "é", u"à"): {'\xc3\xa9': u'\xe0'}
  • obj.__setattr__(u"é", u"à"): {u'\xe9': u'\xe0'}

I don't understand why Python is behaving with these differences

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