来自菜鸟教程
https://www.runoob.com/python/python-exercise-example43.html
题目：模仿静态变量(static)另一案例。
程序分析：演示一个python作用域使用方法
程序源代码：
实例
#!/usr/bin/python
# -*- coding: UTF-8 -*-
class Num:
nNum = 1
def inc(self):
self.nNum += 1
print ('nNum = %d' % self.nNum)
if __name__ == '__main__':
nNum = 2
inst = Num()
for i in range(3):
nNum += 1
print ('The num = %d' % nNum)
inst.inc()
以上实例输出结果为：
The num = 3
nNum = 2
The num = 4
nNum = 3
The num = 5
nNum = 4
头脑总是模模糊糊，是压力太大？
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