在python3中将一个类文件中的变量调用到另一个文件

Question

嗨，我是python编程的新手。请在python3中帮助我解决此问题：

pack.py

class one:

    def test(self):
        number = 100   ######I want to access this value and how?
        print('test')

class two:

    def sample(self):
        print('sample')

另一个

from pack import *

class three:

    def four(self):
        obj = one()
        print(obj.test())

###### I want to access the number value in this file and i don't know how #######

obj = three()
obj.four()

Answer 1

number需要在全局范围内，这意味着在函数定义之外（不应该缩进）

如果变量在函数中，则无法在另一个文件中获取它

pack.py

number = 100
def test():
   test.other_number = 999 # here we assigne a variable to the function object.
   print("test")

另一个

import pack

pack.test()
print(pack.number)

print(test.other_number) # this only works if the function has been called once

或者，如果您正在使用类：

pack.py

class Someclass():
    other_number = 999 # here we define a class variable

    def __init__(self):
        self.number = 100 # here we set the number to be saved in the class

    def test(self):
        print(self.number) # here we print the number

另一个

import pack

somclass_instance = pack.Someclass() # we make a new instance of the class. this runs the code in __init__
somclass_instance.test() # here we call the test method of Someclass
print(somclass_instance.number) # and here we get the number

print(Someclass.other_number) # here we retrieve the class variable