如何将变量作为变量名称传递给函数？

def func(variables):
    return variables['variable_name']

variable_name = 'value'
variables = {'variable_name': variable_name}
result = func(variables)
print(result)  # 输出：value

def func(variable_name):
    exec(f"global {variable_name}; result = {variable_name}")
    return result

variable_name = 'value'
result = func('variable_name')
print(result)  # 输出：value

def func(variable_name):
    return eval(variable_name)

variable_name = 'value'
result = func('variable_name')
print(result)  # 输出：value

import java.lang.reflect.Field;

public class Main {
    public static void main(String[] args) throws Exception {
        String variableName = "value";
        Field field = Main.class.getDeclaredField(variableName);
        Object value = field.get(new Main());
        System.out.println(value);  // 输出：value
    }
}