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Technically, iteration contexts work by calling the iter built-in function to try to
find an _ _iter_ _ method, which is expected to return an iterator object. If it’s
provided,Python then repeatedly calls this iterator object’s next method to produce
items until a StopIteration exception is raised. If no such _ _iter_ _ method is found,
Python falls back on the _ _getitem_ _ scheme, and repeatedly indexes by offsets as
before, until an IndexError exception is raised.
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class Squares:
 def _ _init_ _(self, start, stop): # Save state when created
  self.value = start - 1
  self.stop = stop
 def _ _iter_ _(self): # Get iterator object on iter( )
  return self
 def next(self): # Return a square on each iteration
  if self.value == self.stop:
   raise StopIteration
  self.value += 1
  return self.value ** 2
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£¬ÕâÑùÖØ¸´Ê¹Ó㬳ö´í¡£ÒªÊ¹ÓÃself.__dict__['name'] = value
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class PrivateExc(Exception): pass
class Privacy:
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