从类中的静态方法 Python 填充一次静态变量 [英] Populate once static variable from static method Python within a class

问题描述

我在 Python 中有一个 A 类，我想填充一个调用静态方法的静态变量，例如:

I have a Class A in Python and I would like to populate the a static variable calling a static method like:

Class A:
   arr = []

   @staticmethod
   def FillArr():
       #do more stuff but for semplicity...
       A.arr = [[2,2,2,]]

  FillArr.__func__()

当我运行代码时，我得到NameError: name A not defined"，所以基本上我无法初始化 arr 静态变量.基本上一旦类被实例化，一旦我想填充静态变量

when I run the code I got 'NameError: name A not defined' so essentially I can't initialize the arr static variable. Essentially once the the class has been instantiated once I would like to populate the static variable

推荐答案

这在 Python 3.6 上完美运行:

This runs flawlessly on Python 3.6:

class A:
   arr = []

   @staticmethod
   def fillArr():
       #do more stuff but for simplicity...
       A.arr = [[2,2,2,]]

A.fillArr()

print (A.arr)

或者，在您的评论中添加额外信息:

Or, with the extra info in your comment:

class A:
    arr = []

    @staticmethod
    def fillArr():
        #do more stuff but for simplicity...
        A.arr = [[2,2,2,]]

    def __init__ (self):
        if not A.arr:
           A.fillArr ()

A ()

print (A.arr)

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