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Original file line number	Diff line number	Diff line change
`@@ -669,6 +669,9 @@ Note that the syntax changed in Python 3.0: you can just say super().__init__()`
`669`	`669`	`http://stackoverflow.com/questions/576169/understanding-python-super-with-init-methods`
`670`	`670`
`671`	`671`	`## 30 range and xrange`
	`672`	`+都在循环时使用,xrange内存性能更好。`
	`673`	`+for i in range(0, 20):`
	`674`	`+for i in xrange(0, 20):`
`672`	`675`	`What is the difference between range and xrange functions in Python 2.X?`
`673`	`676`	`range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements.`
`674`	`677`	`xrange is a sequence object that evaluates lazily.`

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