Get variable types inside a Python class

Question

For the following example, is there a way to get the type of a and b as int and string?

class test(object):
    def __init__(self):
        self.a = 1
        self.b = "abc"

test_obj = test()
for var in vars(test_obj):
     print type(var) # this just returns string type as expected (see explanation below)

"this just returns string type as expected" Why is this expected? — Code-Apprentice, May 08 '19 at 17:15
`vars(test_obj)` is a dictionary and so `var` is just the variable names `'a'` and `'b'`. — Code-Apprentice, May 08 '19 at 17:17

Devesh Kumar Singh · Accepted Answer · 2019-05-08T17:18:42.227

4

You need to iterate on the values, but you are iterating on the keys of vars(test_obj), when you do that, it works.

Also you can get the name of object using value.__class__.__name__

class test(object):
    def __init__(self):
        self.a = 1
        self.b = "abc"

test_obj = test()

print(vars(test_obj))
#Iterate on values
for value in vars(test_obj).values():
    #Get name of object
    print(value.__class__.__name__)

The output will be

int
str

edited May 08 '19 at 17:18

answered May 08 '19 at 17:15

Devesh Kumar Singh

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I think he wants the string `'int'`, not the object `` – Barmar May 08 '19 at 17:16
Updated, Thanks @Barmar :) – Devesh Kumar Singh May 08 '19 at 17:17
1

No worries! People make mistakes :) Glad to help @Lemon ! If the answer helped you, please consider accepting it by clicking the tick next to it :) Please also consider taking a look at stackoverflow.com/help/someone-answers :) – Devesh Kumar Singh May 08 '19 at 17:19

score 1 · Answer 2 · answered May 08 '19 at 17:18

class test(object):
    def __init__(self):
        self.a = 1
        self.b = "abc"

test_obj = test()

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

You access the attr as well which will return a and b. value will return the values of the variables.

score 0 · Answer 3 · answered May 17 '19 at 07:37

One example also printing the type:

class test(object):
    def __init__(self):
        self.a = 1
        self.b = "abc"

test_obj = test()

print(vars(test_obj))

# print(dir(test_obj))

#Iterate on values
for k, v in vars(test_obj).items():
    print('variable is {0}: and variable value is {1}, of type {2}'.format(k,v, type(v)))

Will provide:

{'a': 1, 'b': 'abc'}
variable is a: and variable value is 1, of type <class 'int'>
variable is b: and variable value is abc, of type <class 'str'>

Get variable types inside a Python class

3 Answers3