20161217py Learning Notes: Magic Method/

1, Magic methods are also method, but also the definition of class used to function, but the names of these functions, both front and back are double underline.

Initialization: __init__

Class FooBar:

def __init__ (self,value=42):

Self.somevar=value

Originally want to use ' somevar ', probably have to write like this:

>>>f=foobar ()

>>>f.__init__

#如果__init__下还有几个self. some*, such a write is fully quoted, but we want to use only Somevar, so with __init__ can be written in the following form:

>>>f=foobar ()

>>>f.somevar #定义在初始化中, take it straight.

>>>42

#加个参数也可以:

>>>f=foobar (' This is a constructor argument ')

>>>f.somevar

>>>this is aconstructor argument

20161217py Learning Notes: Magic Method/