python defining the iterator protocol

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Angelo
03 May 2017
1class RangeTen:
2  def __init__(self, *args): pass # optional
3  
4  def __iter__(self):
5    '''Initialize the iterator.'''
6    self.count = -1
7    return self
8  
9  def __next__(self):
10  	'''Called for each iteration. Raise StopIteration when done.'''
11    if self.count < 9:
12      self.count += 1
13      return self.count
14
15    raise StopIteration
16    
17for x in RangeTen():
18  print(x) # 0, 1, ..., 9
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