Getting A Dictionary Of Class Variables And Values

I am working on a method to return all the class variables as keys and values as values of a dictionary , for instance i have: first.py class A: a = 3 b = 5 c = 6 Then

Solution 1:

You need to filter out functions and built-in class attributes.

>>> class A:
...     a = 3
...     b = 5
...     c = 6
... 
>>> {key:value for key, value in A.__dict__.items() if not key.startswith('__') and not callable(key)}
{'a': 3, 'c': 6, 'b': 5}

Solution 2:

Something like this?

  class A(object):
      def __init__(self):
          self.a = 3
          self.b = 5
          self.c = 6

  def return_class_variables(A):
      return(A.__dict__)


  if __name__ == "__main__":
      a = A()
      print(return_class_variables(a))

which gives

{'a': 3, 'c': 6, 'b': 5}

Solution 3:

Use a dict comprehension on A.__dict__ and filter out keys that start and end with __:

>>> class A:
        a = 3
        b = 5
        c = 6
...     
>>> {k:v for k, v in A.__dict__.items() if not (k.startswith('__')
                                                             and k.endswith('__'))}
{'a': 3, 'c': 6, 'b': 5}

Solution 4:

Best solution and most pythonic is to use var(class_object) or var(self) (if trying to use inside class).

This although do avoids dictionary pairs where the key is another object and not a default python type.

>>> class TheClass():
>>>    def __init__(self):
>>>        self.a = 2
>>>        self.b = 1
>>>        print(vars(self))
>>> class_object= TheClass()
{'a'=2, 'b'=1}

Or outside class

>>> vars(class_object)
{'a': 2, 'b': 1}