在Python的类级别定义的所有变量均被视为静态
class Example:
Variable = 2 # static variable
print Example.Variable # prints 2 (static variable)
# Access through an instance
instance = Example()
print instance.Variable # still 2 (ordinary variable)
# Change within an instance
instance.Variable = 3 #(ordinary variable)
print instance.Variable # 3 (ordinary variable)
print Example.Variable # 2 (static variable)
# Change through Class
Example.Variable = 5 #(static variable)
print instance.Variable # 3 (ordinary variable)
print Example.Variable # 5 (static variable)
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