getting a dictionary of class variables and values

问题:

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 in the second.py i should be able to call maybe a method or something that will return a dictionary like this

import first

dict = first.return_class_variables()
dict

then dict will be something like this:

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

This is just a scenario to explain the idea, of course i don't expect it to be that easy, but i will love if there are ideas on how to handle this problem just like dict can be used to set a class variables values by passing to it a dictionary with the variable, value combination as key, value.

回答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}

回答2:

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}

回答3:

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}