Assigning values to a static attribute from outside the file

Question

The following assign.py should send the value correctly to class1.py. However, the printing return 0.0. I made dict as a static so I can assign to it from outside file. Am I missing something?

class1.py

class Class1():
   dict = {}

   def set_dictionary(x,y,z):
       if (x, y) not in Class.dict:
          Class1.dict[(x, y)] = 0.0
       Class1.dict[(x,y)] = z
       print ("(%s --> %s) = %s" % (x,y,z))

assign.py

import class1 as cnt

cnt.Class1.set_dictionary('s1','s2', 100)

Your code doesn't work ("Class" is not defined) but when I fix that, it runs as expected. I cannot duplicate. — tdelaney
– tdelaney, Commented Jan 21, 2017 at 22:08
What are you trying to do with this code? There is a conventional way to do object oriented programming in Python. The language lets you break those conventions. But that's usually a bad idea. In this case it's not at all clear what you expect this code to do. — Håken Lid
– Håken Lid, Commented Jan 21, 2017 at 22:09

user2390182 · Accepted Answer · 2017-01-21 22:38:42Z

1

As suggested in the comments, a classmethod is the way to go:

# class1.py
class Class1(object):
  dic = {}  # don't shadow built-ins

  @classmethod
  def set_dictionary(cls, x, y, z):
    cls.dic[(x,y)] = z
    print ("(%s --> %s) = %s" % (x, y, z))

# assign.py
import class1 as cnt
cnt.Class1.set_dictionary('s1','s2', 100)

>>> Class1.set_dictionary('s1','s2', 100)
(s1 --> s2) = 100

More on the different kinds of methods in Python.

answered Jan 21, 2017 at 22:38

user2390182

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