To solve these problems I propose to add simple syntax that assigns
these attributes to arbitrary object:
def name = expression
other possible forms may be:
def name from expression
class name = expression
class name from expression
name := expression # new operator


which would be equivalent for:
_tmp = expression
_tmp.__name__ = 'name'
_tmp.__qualname__ = ... # corresponding qualname
_tmp.__module__ = __name__
# apply decorators if present
name = _tmp