26 lines
563 B
Python
26 lines
563 B
Python
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"""
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Arithmetic progression class
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>>> ap = ArithmeticProgression(1, .5, 3)
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>>> list(ap)
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[1.0, 1.5, 2.0, 2.5]
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"""
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class ArithmeticProgression:
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def __init__(self, begin, step, end=None):
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self.begin = begin
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self.step = step
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self.end = end # None -> "infinite" series
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def __iter__(self):
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result_type = type(self.begin + self.step)
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result = result_type(self.begin)
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forever = self.end is None
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while forever or result < self.end:
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yield result
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result += self.step
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