9. What will be the output of the following Python code? x = 50 def fun1(): x = 25 print(x) fun1() print(x)
时间: 2024-05-05 09:22:43 浏览: 20
The output of the code will be:
```
25
50
```
Explanation:
- First, we define a global variable `x` and assign it a value of `50`.
- Then, we define a function `fun1()` which has its own local variable `x` with a value of `25`.
- When we call the function `fun1()`, it prints the local variable `x` which is `25`.
- Finally, we print the value of the global variable `x` which is still `50`.
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What is IoC(Inversion of Control)? Describe the implementation of IoC using pseudo Code.
IoC, or Inversion of Control, refers to the principle of designing software in such a way that the flow of control is inverted from the traditional approach. Instead of the application code controlling the flow of execution, the control is delegated to a framework or container that manages the lifecycle of the objects and their dependencies.
The implementation of IoC can be achieved using a technique called dependency injection, which involves injecting the necessary dependencies of an object into it when it is created. This allows the object to be decoupled from its dependencies, making it more modular and easier to test.
Here is an example of how IoC can be implemented using pseudo code:
```
// Define an interface for the object that requires dependencies
interface IMyObject {
void doSomething();
}
// Define the implementation of the object that requires dependencies
class MyObject implements IMyObject {
private IDependency dependency;
// Constructor injection
public MyObject(IDependency dependency) {
this.dependency = dependency;
}
// Method that uses the dependency
public void doSomething() {
dependency.doStuff();
}
}
// Define the interface for the dependency
interface IDependency {
void doStuff();
}
// Define the implementation of the dependency
class MyDependency implements IDependency {
public void doStuff() {
// Implementation code
}
}
// Create an instance of the dependency
IDependency dependency = new MyDependency();
// Create an instance of the object and inject the dependency
IMyObject myObject = new MyObject(dependency);
// Call the method on the object, which will use the dependency
myObject.doSomething();
```
In this example, the MyObject class requires a dependency to perform its task. Rather than creating the dependency within the object, the dependency is injected into the object through its constructor. This allows the object to be decoupled from its dependencies and makes it easier to test and maintain. The IDependency interface and MyDependency class provide the implementation of the dependency, which can be swapped out for a different implementation if needed.