是否有一种方法可以获取类实例上存在的属性列表?
class new_class():
def __init__(self, number):
self.multi = int(number) * 2
self.str = str(number)
a = new_class(2)
print(', '.join(a.SOMETHING))
期望的结果是输出"multi, str"。我希望它能看到脚本各个部分的当前属性。
是否有一种方法可以获取类实例上存在的属性列表?
class new_class():
def __init__(self, number):
self.multi = int(number) * 2
self.str = str(number)
a = new_class(2)
print(', '.join(a.SOMETHING))
期望的结果是输出"multi, str"。我希望它能看到脚本各个部分的当前属性。
当前回答
做这件事的方法不止一种:
#! /usr/bin/env python3
#
# This demonstrates how to pick the attiributes of an object
class C(object) :
def __init__ (self, name="q" ):
self.q = name
self.m = "y?"
c = C()
print ( dir(c) )
当运行时,这段代码产生:
jeffs@jeff-desktop:~/skyset$ python3 attributes.py
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'm', 'q']
jeffs@jeff-desktop:~/skyset$
其他回答
人们经常提到,要列出一个完整的属性列表,应该使用dir()。但是请注意,与普遍观点相反,dir()并没有显示所有属性。例如,你可能会注意到__name__可能在类的dir()列表中缺失,即使你可以从类本身访问它。从dir()的文档(Python 2, Python 3):
因为提供dir()主要是为了方便在 交互式提示符,它试图提供一组有趣的名称 它不仅仅是试图提供一个严格或一致定义的集合 的名称,其详细行为可能在不同版本之间更改。为 属性时,元类属性不在结果列表中 参数是一个类。
像下面这样的函数往往更完整,尽管不能保证完整性,因为dir()返回的列表可能受到许多因素的影响,包括实现__dir__()方法,或在类或其父类之一上自定义__getattr__()或__getattribute__()。详情请参阅所提供的链接。
def dirmore(instance):
visible = dir(instance)
visible += [a for a in set(dir(type)).difference(visible)
if hasattr(instance, a)]
return sorted(visible)
__attrs__给出了一个实例的属性列表。
>>> import requests
>>> r=requests.get('http://www.google.com')
>>> r.__attrs__
['_content', 'status_code', 'headers', 'url', 'history', 'encoding', 'reason', 'cookies', 'elapsed', 'request']
>>> r.url
'http://www.google.com/'
>>>
你可以使用dir(your_object)来获取属性,使用getattr(your_object, your_object_attr)来获取值
用法:
for att in dir(your_object):
print (att, getattr(your_object,att))
如果你的对象没有__dict__,这特别有用。如果不是这样,你也可以尝试var(your_object)
你要这个干什么?如果不知道你的确切意图,可能很难得到最好的答案。
It is almost always better to do this manually if you want to display an instance of your class in a specific way. This will include exactly what you want and not include what you don't want, and the order will be predictable. If you are looking for a way to display the content of a class, manually format the attributes you care about and provide this as the __str__ or __repr__ method for your class. If you want to learn about what methods and such exist for an object to understand how it works, use help. help(a) will show you a formatted output about the object's class based on its docstrings. dir exists for programatically getting all the attributes of an object. (Accessing __dict__ does something I would group as the same but that I wouldn't use myself.) However, this may not include things you want and it may include things you do not want. It is unreliable and people think they want it a lot more often than they do. On a somewhat orthogonal note, there is very little support for Python 3 at the current time. If you are interested in writing real software you are going to want third-party stuff like numpy, lxml, Twisted, PIL, or any number of web frameworks that do not yet support Python 3 and do not have plans to any time too soon. The differences between 2.6 and the 3.x branch are small, but the difference in library support is huge.
attributes_list = [attribute for attribute in dir(obj) if attribute[0].islower()]