Question

以下assign.py应将值正确发送到class1.py。但是，打印返回0.0。我将dict作为静态，因此我可以从外部文件分配给它。我错过了什么吗？

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)

Answer 1

正如评论中所建议的那样，classmethod是可行的方法：

# 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

更多关于the different kinds of methods in Python。

将值分配给文件外部的静态属性

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