在python中使用范围为全局的变量

global_var = 10

def modify_global_variable():
    global global_var
    global_var = 20

modify_global_variable()
print(global_var)  # 输出 20

# module.py
module_level_var = 10

def modify_global_variable():
    global module_level_var
    module_level_var = 20

# main.py
import module

print(module.module_level_var)  # 输出 10
module.modify_global_variable()
print(module.module_level_var)  # 输出 20

class MyClass:
    class_level_var = 10

    def modify_global_variable(self):
        MyClass.class_level_var = 20

obj = MyClass()
print(obj.class_level_var)  # 输出 10
obj.modify_global_variable()
print(obj.class_level_var)  # 输出 20