“global”是类访问模块级变量的正确方法吗?

global 是一种“代码气味”:表示不需要的代码设计的东西。在本例中,您只是尝试为类的所有实例创建一个资源。首选策略是 class attribute

class VariableScope():
    _variableScope = ''

    def __init__(self, scope):
        self._scope = scope

    def __enter__(self):
        VariableScope._variableScope += self._scope

x = VariableScope('mytest')
x.__enter__()
print(VariableScope._variableScope)

y = VariableScope('add-to-scope')
y.__enter__()
print(VariableScope._variableScope)

输出:

mytest
mytestadd-to-scope