Commit652b31b

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add 单例import方法

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`@@ -453,6 +453,25 @@ class MyClass:`
`453`	`453`	`...`
`454`	`454`	```
`455`	`455`
	`456`	`+###4 import方法`
	`457`	`+`
	`458`	`+作为python的模块是天然的单例模式`
	`459`	`+`
	`460`	+```python
	`461`	`+# mysingleton.py`
	`462`	`+classMy_Singleton(object):`
	`463`	`+deffoo(self):`
	`464`	`+pass`
	`465`	`+`
	`466`	`+my_singleton= My_Singleton()`
	`467`	`+`
	`468`	`+# to use`
	`469`	`+from mysingletonimport my_singleton`
	`470`	`+`
	`471`	`+my_singleton.foo()`
	`472`	`+`
	`473`	+```
	`474`	`+`
`456`	`475`	`##17 Python中的作用域`
`457`	`476`
`458`	`477`	`Python 中，一个变量的作用域总是由在代码中被赋值的地方所决定的。`

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