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我有一个代码，其中几乎没有类。在 下SecondClass，有一个函数叫做plot_image。在这个函数下，定义了三个变量my_x, my_y, my_z。我试图使这些变量在同一个类中调用的其他一些函数中可访问。这是一个伪代码段形式的非工作示例：get_histogram

import some_modules_in_here #these are required for classes below

#===================================================================================================
# utility
#===================================================================================================
class FirstClass(something.something.SayClass):
    def file1(self, some_arguments):
        pros = do_something
        return pros


#===================================================================================================
# visualize
#===================================================================================================
class SecondClass(something.something.SayClass):

    def plot_image(self, some_parameter):
        if some_parameter is not None:
            my_x = some_value1
            my_y = some_value2
            my_z = some_value3

    def get_histogram(self, some_parameter, some_other_parameter, return_info):
        if '3d' in some_parameter:
            do_this
        else:
            do_that 
            if some_other_parameter:
                calculate_something
                if return_info:
                    for k, l, m in zip(my_x, my_y, my_z):
                        do_some_stuff
                        print(something_in_here)
        return_value = do_something_else_in_here
        return  return_value

.
.
.

    def print_values(self):
        '''
        write some values of image to file.
        '''

Second = SecondClass()

global我尝试了函数顶部的关键字，plot_image但这并没有为我提供错误信息：

“NameError：名称‘my_x’未定义。”

解决办法是什么？

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