python如何看变量属性

python中查看变量属性的

1、使用dir()函数查看

dir()函数不带参数时，返回当前范围内的变量、方法和定义的类型列表；带参数时，返回参数的属性、方法列表。

$python
Python2.7.8(default,Sep242015,18:26:19)
[GCC4.9.220150212(RedHat4.9.2-6)]onlinux2
Type"help","copyright","credits"or"license"formoreinformation.
>>>importcv2
>>>mser=cv2.MSER()
>>>dir(mser)
['__class__','__delattr__','__doc__','__format__','__getattribute__','__hash__','__init__','__new__','__reduce__','__reduce_ex__','__repr__','__setattr__','__sizeof__','__str__','__subclasshook__','detect','empty','getAlgorithm','getBool','getDouble','getInt','getMat','getMatVector','getParams','getString','paramHelp','paramType','setAlgorithm','setBool','setDouble','setInt','setMat','setMatVector','setString']

2、使用vars()函数查看

vars()函数返回对象object的属性和属性值的字典对象。

>>>vars(mser)
Traceback(mostrecentcalllast):
File"<stdin>",line1,in<module>
TypeError:vars()argumentmusthave__dict__attribute
>>>mser.__dict__
Traceback(mostrecentcalllast):
File"<stdin>",line1,in<module>
AttributeError:'cv2.MSER'objecthasnoattribute'__dict__'