Python iterating through object attributes

Question

How do I iterate over an object's attributes in Python?

I have a class:

class Twitt:
    def __init__(self):
        self.usernames = []
        self.names = []
        self.tweet = []
        self.imageurl = []

    def twitter_lookup(self, coordinents, radius):
        cheese = []
        twitter = Twitter(auth=auth)
        coordinents = coordinents + "," + radius
        print coordinents
        query = twitter.search.tweets(q="", geocode=coordinents, rpp=10)
        for result in query["statuses"]:
            self.usernames.append(result["user"]["screen_name"])
            self.names.append(result['user']["name"])
            self.tweet.append(h.unescape(result["text"]))
            self.imageurl.append(result['user']["profile_image_url_https"])

Now I can get my info by doing this:

k = Twitt()
k.twitter_lookup("51.5033630,-0.1276250", "1mi")
print k.names

I want to be able to do is iterate over the attributes in a for loop like so:

for item in k:
   print item.names

I may not be using the proper terminology here but yes I want to be able to have my usernames, tweets, etc. returned in some sort of object that i can iterate through them individually. like so: for item in twitter print item.usernames. Something along those lines. — Zach Johnson, Aug 06 '14 at 01:41

score 153 · Accepted Answer · edited Jun 27 '18 at 02:46

153

UPDATED

For python 3, you should use items() instead of iteritems()

PYTHON 2

for attr, value in k.__dict__.iteritems():
        print attr, value

PYTHON 3

for attr, value in k.__dict__.items():
        print(attr, value)

This will print

'names', [a list with names]
'tweet', [a list with tweet]

edited Jun 27 '18 at 02:46

Joshua Schlichting

3,110
6
28
54

answered Aug 06 '14 at 01:36

levi

22,001
7
73
74

7

k.iteritems() was removed in Python3, use k.items() instead. – trdavidson Sep 18 '16 at 22:11
1

@trdavidson I added the note. – levi Sep 18 '16 at 22:13
3

Also new in python3 you need parens for the print operation. – Free Url Oct 08 '17 at 00:58
Hidden `__dict__` method very useful! Also, to return as a dict use a dict comprehension `print({attr:value for attr, value in k.__dict__.iteritems()})` – Davos Mar 13 '18 at 02:40
1

I tried this on an object which is inheriting from another one, and it only returned the properties belonging to the base class. – alex Jun 08 '18 at 19:21
1

This works if and only if the object has a `__dict__` attribute. This is [not always true](https://docs.python.org/3/reference/datamodel.html#slots), and you should iterate through `__slots__` if it doesn't. – Konstantin Sekeresh Nov 29 '19 at 11:47

score 43 · Answer 2 · answered Aug 08 '16 at 17:07

43

You can use the standard Python idiom, vars():

for attr, value in vars(k).items():
    print(attr, '=', value)

answered Aug 08 '16 at 17:07

arekolek

9,128
3
58
79

Eric Leschinski · Answer 3 · 2015-02-02T22:19:22.083

Iterate over an objects attributes in python:

class C:
    a = 5
    b = [1,2,3]
    def foobar():
        b = "hi"    

for attr, value in C.__dict__.iteritems():
    print "Attribute: " + str(attr or "")
    print "Value: " + str(value or "")

Prints:

python test.py
Attribute: a
Value: 5
Attribute: foobar
Value: <function foobar at 0x7fe74f8bfc08>
Attribute: __module__
Value: __main__
Attribute: b
Value: [1, 2, 3]
Attribute: __doc__
Value:

Python iterating through object attributes

3 Answers3

Iterate over an objects attributes in python:

Linked